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346 listings
  • $57,999
    great price
    $9,792 below market
    • 52,991 miles
    • No accidents, 2 owners, personal use only
    • 6'10” bed, 6.6l, 8cyl
    • Romeo Chevrolet Buick GMC (69 mi away)
    • Home delivery*
    • AWD/4WD
    • Back-up camera
    • Bluetooth
    • Leather Seats
    • Sunroof/Moonroof
    Close

    Located in Lake Katrine, NY / 69 miles away from Bridgeport, CT

    Romeo GM Center Proudly presents this 2021 GMC Sierra 2500HD with AT4 Preferred Package (Bed View Camera w/2 Trailer Camera Provisions, Bose Premium 7...

    AutoCheck Vehicle History Summary

    Accident Free Vehicle: Yes

    Personal Use Only: Yes

    History Provider: AutoCheck

    Title Details: Clean Title

    Salvage Vehicle: No

    Frame Damage: No

    Theft History: No

    Lemon Status: No

    Free History Report: No

    Features and Specs:

    Listing Information:

    VIN: 1GT49PEY2MF123929
    Stock: 25493A
    Certified Pre-Owned: No
    Listed since: 04-29-2025

    • 59,527 miles
    • No accidents, 1 owner, personal use only
    • Generation Buick GMC (29 mi away)
    • 4WD
    • Forge Perforated Lea...
    • Heated Driver & Fron...
    • Apple CarPlay
    • Rear Cross Traffic A...
    Close

    Located in Bohemia, NY / 29 miles away from Bridgeport, CT

    Certified. Pacific Blue Metallic 2022 GMC Sierra 2500HD Denali CERTIFIED 4WD 10-Speed Automatic Duramax 6.6L V8 Turbodiesel 10-Speed Automatic, 4WD, J...

    AutoCheck Vehicle History Summary

    Accident Free Vehicle: Yes

    Personal Use Only: Yes

    History Provider: AutoCheck

    Title Details: Clean Title

    Salvage Vehicle: No

    Frame Damage: No

    Theft History: No

    Lemon Status: No

    Free History Report: No

    Features and Specs:

    Listing Information:

    VIN: 1GT49REY2NF275089
    Stock: U1225
    Certified Pre-Owned: Yes
    Listed since: 05-04-2025

  • $67,966
    great price
    $11,646 below market
    • 21,773 miles
    • No accidents, 1 owner, personal use
    • 6'10” bed, 6.6l, 8cyl
    • Milea Buick GMC (40 mi away)
    • AWD/4WD
    • Back-up camera
    • Bluetooth
    • Leather Seats
    • Sunroof/Moonroof
    Close

    Located in Bronx, NY / 40 miles away from Bridgeport, CT

    GM CERTIFIED UNIT! WOW CHECK OUT THIS BAD TO THE BONE SIERRA 2500HD AT4 OFF ROAD EDITION IN WHITE WITH 21,773 MILES! 6.6 DURAMAX DIESEL, ALISSON TRANS...

    AutoCheck Vehicle History Summary

    Accident Free Vehicle: Yes

    Personal Use Only: Yes

    History Provider: AutoCheck

    Title Details: Clean Title

    Salvage Vehicle: No

    Frame Damage: No

    Theft History: No

    Lemon Status: No

    Free History Report: No

    Features and Specs:

    Listing Information:

    VIN: 1GT49PEY6PF144514
    Stock: 13580X
    Certified Pre-Owned: Yes
    Listed since: 04-30-2025

    • 37,495 miles
    • No accidents, 1 owner, personal use
    • 6'10” bed, 6.6l, 8cyl
    • Ingersoll Auto of Danbury (20 mi away)
    • AWD/4WD
    • Bluetooth
    • Navigation
    • Leather Seats
    • Keyless Entry/Start
    Close

    Located in Danbury, CT / 20 miles away from Bridgeport, CT

    CARFAX One-Owner. Clean CARFAX. Sierra 2500HD AT4X, 6.6L V8, 4WD, 120-Volt Bed Mounted Power Outlet, 120-Volt Instrument Panel Power Outlet, 2 Charge-...

    AutoCheck Vehicle History Summary

    Accident Free Vehicle: Yes

    Personal Use Only: Yes

    History Provider: AutoCheck

    Title Details: Clean Title

    Salvage Vehicle: No

    Frame Damage: No

    Theft History: No

    Lemon Status: No

    Free History Report: No

    Features and Specs:

    Listing Information:

    VIN: 1GT49ZE7XRF281378
    Stock: A281378
    Certified Pre-Owned: No
    Listed since: 05-12-2025

  • Advertisement

    Special offers available

    2025 GMC Sierra HD Denali
    $46,300
    starting MSRP
    • 2 Trims
    View Offers 
    *The Manufacturer’s Suggested Retail Price excludes destination freight charge, tax, title, license, dealer fees, and optional equipment. Dealer sets final price. Click here to see all GMC vehicles’ destination freight charges.
    • 33,598 miles
    • No accidents, 1 owner, personal use only
    • 6'10” bed, 6.6l, 8cyl
    • CarMax (In-stock online)
    • Transfer available from TX to CT*
    • AWD/4WD
    • Back-up camera
    • Bluetooth
    • Upgraded Headlights
    • Tire Pressure Warnin...
    Close

    Located in Killeen, TX / 1,528 miles away from Bridgeport, CT

    CarMax values transparency and wants you to love your next car, not settle on it. Certain vehicles may have unrepaired safety recalls. Check nhtsa.gov...

    AutoCheck Vehicle History Summary

    Accident Free Vehicle: Yes

    Personal Use Only: Yes

    History Provider: AutoCheck

    Title Details: Clean Title

    Salvage Vehicle: No

    Frame Damage: No

    Theft History: No

    Lemon Status: No

    Free History Report: No

    Features and Specs:

    Listing Information:

    VIN: 1GT49LEY7PF230553
    Stock: 26782323
    Certified Pre-Owned: No

  • Stock photo**
    • 49,417 miles
    • No accidents, 1 owner, personal use only
    • 8'2” bed, 6.6l, 8cyl
    • D'Addario Nissan (10 mi away)
    • AWD/4WD
    • Back-up camera
    • Bluetooth
    • Leather Seats
    • Keyless Entry/Start
    Close

    Located in Shelton, CT / 10 miles away from Bridgeport, CT

    Recent Arrival! Certified. 2022 GMC Sierra 2500HD SLT 4WD 6-Speed Automatic 6.6L V8 6-Speed Automatic, 4WD, Jet Black Leather. Clean CARFAX. CARFAX On...

    AutoCheck Vehicle History Summary

    Accident Free Vehicle: Yes

    Personal Use Only: Yes

    History Provider: AutoCheck

    Title Details: Clean Title

    Salvage Vehicle: No

    Frame Damage: No

    Theft History: No

    Lemon Status: No

    Free History Report: No

    Features and Specs:

    Listing Information:

    VIN: 1GT49NE75NF247805
    Stock: G5303A
    Certified Pre-Owned: No
    Listed since: 05-21-2025

  • New Listing
    Stock photo**
    • 61,736 miles
    • No accidents, 1 owner, personal use only
    • 6'10” bed, 6.6l, 8cyl
    • Romeo Chevrolet Buick GMC (69 mi away)
    • Home delivery*
    • AWD/4WD
    • Bluetooth
    • Navigation
    • Leather Seats
    • Sunroof/Moonroof
    Close

    Located in Lake Katrine, NY / 69 miles away from Bridgeport, CT

    Romeo GM Center Proudly presents this 2024 GMC Sierra 2500HD with AT4 Preferred Package (Adaptive Cruise Control, LED Smoked Amber Roof Marker Lamps, ...

    AutoCheck Vehicle History Summary

    Accident Free Vehicle: Yes

    Personal Use Only: Yes

    History Provider: AutoCheck

    Title Details: Clean Title

    Salvage Vehicle: No

    Frame Damage: No

    Theft History: No

    Lemon Status: No

    Free History Report: No

    Features and Specs:

    Listing Information:

    VIN: 1GT49PEY9RF108710
    Stock: 25551A
    Certified Pre-Owned: No
    Listed since: 06-02-2025

  • Stock photo**
    • 57,162 miles
    • No accidents, 2 owners, personal use only
    • 6'10” bed, 6.6l, 8cyl
    • East Hartford Chevrolet (50 mi away)
    • AWD/4WD
    • Back-up camera
    • Bluetooth
    • Navigation
    • Leather Seats
    Close

    Located in East Hartford, CT / 50 miles away from Bridgeport, CT

    East Hartford Chevrolet - 585 Connecticut Blvd. - East Hartford - CT - 06108.View our full inventory: www.EastHartfordChevy.com.2022 Sierra 2500HD ...

    AutoCheck Vehicle History Summary

    Accident Free Vehicle: Yes

    Personal Use Only: Yes

    History Provider: AutoCheck

    Title Details: Clean Title

    Salvage Vehicle: No

    Frame Damage: No

    Theft History: No

    Lemon Status: No

    Free History Report: No

    Features and Specs:

    Listing Information:

    VIN: 1GT49RE7XNF173028
    Stock: 250409A
    Certified Pre-Owned: No
    Listed since: 05-28-2025

  • Advertisement

    Special offers available

    2025 GMC Sierra HD Denali
    $46,300
    starting MSRP
    • 2 Trims
    View Offers 
    *The Manufacturer’s Suggested Retail Price excludes destination freight charge, tax, title, license, dealer fees, and optional equipment. Dealer sets final price. Click here to see all GMC vehicles’ destination freight charges.
  • Stock photo**
    • 20,550 miles
    • 1 accident, 1 owner, personal use only
    • 6'10” bed, 6.6l, 8cyl
    • Ferrari of Long Island (30 mi away)
    • AWD/4WD
    • Bluetooth
    • Navigation
    • Leather Seats
    • Keyless Entry/Start
    Close

    Located in Plainview, NY / 30 miles away from Bridgeport, CT

    AutoCheck Vehicle History Summary

    Accident Free Vehicle: No

    Personal Use Only: Yes

    History Provider: AutoCheck

    Title Details: Clean Title

    Salvage Vehicle: No

    Frame Damage: No

    Theft History: No

    Lemon Status: No

    Free History Report: No

    Features and Specs:

    Listing Information:

    VIN: 1GT49XEYXRF402116
    Stock: FE2119
    Certified Pre-Owned: No
    Listed since: 05-27-2025

  • $52,985
    great price
    $5,278 below market
    • 74,548 miles
    • No accidents, 1 owner, personal use only
    • 6'10” bed, 6.6l, 8cyl
    • Minchin Buick GMC (19 mi away)
    • AWD/4WD
    • Bluetooth
    • Navigation
    • Leather Seats
    • Sunroof/Moonroof
    Close

    Located in Stamford, CT / 19 miles away from Bridgeport, CT

    CARFAX One-Owner. Clean CARFAX.PASSED - Dealership Quality Assurance Inspection, SOLD AND SERVICED AT MINCHIN, SERVICE RECORDS AVAILABLE, Local Trade,...

    AutoCheck Vehicle History Summary

    Accident Free Vehicle: Yes

    Personal Use Only: Yes

    History Provider: AutoCheck

    Title Details: Clean Title

    Salvage Vehicle: No

    Frame Damage: No

    Theft History: No

    Lemon Status: No

    Free History Report: No

    Features and Specs:

    Listing Information:

    VIN: 1GT49RE71PF171428
    Stock: U1583
    Certified Pre-Owned: No
    Listed since: 05-06-2025

  • New Listing
    • 39,509 miles
    • 8'2” bed, 6.6l, 8cyl
    • Salvage Reseller North (50 mi away)
    • AWD/4WD
    • Bluetooth
    • Navigation
    • Leather Seats
    • Sunroof/Moonroof
    Close

    Located in Marlboro, NY / 50 miles away from Bridgeport, CT

    This vehicle is located at Earlington, KY Copart yard. Join our online auctions to see its final price. All purchases must take place online at www.sa...

    AutoCheck Vehicle History Summary Unavailable.

    Features and Specs:

    Listing Information:

    VIN: 1GT49PEY1RF245432
    Stock: 53338975
    Certified Pre-Owned: No
    Listed since: 02-06-2025

  • Stock photo**
    $68,988
    great price
    $6,633 below market
    • 12,456 miles
    • No accidents, 1 owner, personal use only
    • 6'10” bed, 6.6l, 8cyl
    • Jake Sweeney Express (In-stock online)
    • Home delivery*
    • AWD/4WD
    • Bluetooth
    • Navigation
    • Leather Seats
    • Sunroof/Moonroof
    Close

    Located in Cincinnati, OH / 608 miles away from Bridgeport, CT

    Have you ever wondered where to buy a Certified used car? Look no further! Jake Sweeney is here to Help. If you are in need of a new or used vehicle, ...

    AutoCheck Vehicle History Summary

    Accident Free Vehicle: Yes

    Personal Use Only: Yes

    History Provider: AutoCheck

    Title Details: Clean Title

    Salvage Vehicle: No

    Frame Damage: No

    Theft History: No

    Lemon Status: No

    Free History Report: No

    Features and Specs:

    Listing Information:

    VIN: 1GT49REY9PF224790
    Stock: LP9191
    Certified Pre-Owned: No
    Listed since: 04-11-2025

  • Advertisement

    Special offers available

    2025 GMC Sierra HD Denali
    $46,300
    starting MSRP
    • 2 Trims
    View Offers 
    *The Manufacturer’s Suggested Retail Price excludes destination freight charge, tax, title, license, dealer fees, and optional equipment. Dealer sets final price. Click here to see all GMC vehicles’ destination freight charges.
  • New Listing
    $71,590
    good price
    $5,200 below market
    • 12,776 miles
    • No accidents, 2 owners, personal use
    • 6'10” bed, 6.6l, 8cyl
    • Carvana (In-stock online)
    • Home delivery*
    • AWD/4WD
    • Back-up camera
    • Bluetooth
    • Navigation
    • Leather Seats
    Close

    Located in Indianapolis, IN / 688 miles away from Bridgeport, CT

    At Carvana, we go miles beyond the extra mile. That's why we provide you with a convenient, fast, and hassle-free car buying experience that puts you ...

    AutoCheck Vehicle History Summary

    Accident Free Vehicle: Yes

    Personal Use Only: Yes

    History Provider: AutoCheck

    Title Details: Clean Title

    Salvage Vehicle: No

    Frame Damage: No

    Theft History: No

    Lemon Status: No

    Free History Report: No

    Features and Specs:

    Listing Information:

    VIN: 1GT49REY1PF157862
    Stock: 2003775503
    Certified Pre-Owned: No
    Listed since: 05-28-2025

  • $44,398
    great price
    $5,761 below market
    • 95,107 miles
    • No accidents, 1 owner, personal use
    • 8'2” bed, 6.6l, 8cyl
    • Enterprise Car Sales (In-stock online)
    • Home delivery*
    • AWD/4WD
    • Back-up camera
    • Bluetooth
    • Upgraded Headlights
    • Tire Pressure Warnin...
    Close

    Located in Marietta, GA / 795 miles away from Bridgeport, CT

    Transfer of vehicle from another location to your neighborhood Enterprise Car Sales may require payment of a non-refundable transfer fee to begin the ...

    AutoCheck Vehicle History Summary

    Accident Free Vehicle: Yes

    Personal Use Only: Yes

    History Provider: AutoCheck

    Title Details: Clean Title

    Salvage Vehicle: No

    Frame Damage: No

    Theft History: No

    Lemon Status: No

    Free History Report: No

    Features and Specs:

    Listing Information:

    VIN: 1GT49LEYXPF170672
    Stock: 8GDTHM
    Certified Pre-Owned: No
    Listed since: 05-12-2025

  • $63,951
    good price
    $7,228 below market
    • 64,536 miles
    • No accidents, 1 owner, personal use only
    • 6'10” bed, 6.6l, 8cyl
    • Cargill Chevrolet (84 mi away)
    • AWD/4WD
    • Back-up camera
    • Bluetooth
    • Leather Seats
    • Sunroof/Moonroof
    Close

    Located in Putnam, CT / 84 miles away from Bridgeport, CT

    The 2023 GMC Sierra 2500HD AT4 is a heavy-duty pickup truck built for drivers who need serious capability paired with off-road readiness and refined c...

    AutoCheck Vehicle History Summary

    Accident Free Vehicle: Yes

    Personal Use Only: Yes

    History Provider: AutoCheck

    Title Details: Clean Title

    Salvage Vehicle: No

    Frame Damage: No

    Theft History: No

    Lemon Status: No

    Free History Report: No

    Features and Specs:

    Listing Information:

    VIN: 1GT49PEY5PF136789
    Stock: P1492
    Certified Pre-Owned: No
    Listed since: 02-18-2025

  • Price Drop
    $44,939
    fair price
    $1,932 below market
    • 28,393 miles
    • No accidents, 3 owners, personal use only
    • 6'10” bed, 6.6l, 8cyl
    • Romeo Chevrolet Buick GMC (69 mi away)
    • Home delivery*
    • AWD/4WD
    • Back-up camera
    • Bluetooth
    • Keyless Entry/Start
    • Upgraded Headlights
    Close

    Located in Lake Katrine, NY / 69 miles away from Bridgeport, CT

    New Price! Romeo GM Center Proudly presents this 2021 GMC Sierra 2500HD with Assist Step & Floor Liner Package (LPO) (1st & 2nd Row All-Weather Floor ...

    AutoCheck Vehicle History Summary

    Accident Free Vehicle: Yes

    Personal Use Only: Yes

    History Provider: AutoCheck

    Title Details: Clean Title

    Salvage Vehicle: No

    Frame Damage: No

    Theft History: No

    Lemon Status: No

    Free History Report: No

    Features and Specs:

    Listing Information:

    VIN: 1GT59ME70MF292017
    Stock: 25471SSA
    Certified Pre-Owned: No
    Listed since: 04-25-2025

  • Advertisement

    Special offers available

    2025 GMC Sierra HD Denali
    $46,300
    starting MSRP
    • 2 Trims
    View Offers 
    *The Manufacturer’s Suggested Retail Price excludes destination freight charge, tax, title, license, dealer fees, and optional equipment. Dealer sets final price. Click here to see all GMC vehicles’ destination freight charges.
  • $54,999
    good price
    $3,741 below market
    • 43,001 miles
    • No accidents, 1 owner, personal use only
    • 6'10” bed, 6.6l, 8cyl
    • Diamond Chevrolet Buick GMC (99 mi away)
    • AWD/4WD
    • Back-up camera
    • Bluetooth
    • Leather Seats
    • Sunroof/Moonroof
    Close

    Located in Auburn, MA / 99 miles away from Bridgeport, CT

    At Diamond Auto Group we want you to know that all our vehicles are priced at a competitive value position to the market. We use an independent 3rd pa...

    AutoCheck Vehicle History Summary

    Accident Free Vehicle: Yes

    Personal Use Only: Yes

    History Provider: AutoCheck

    Title Details: Clean Title

    Salvage Vehicle: No

    Frame Damage: No

    Theft History: No

    Lemon Status: No

    Free History Report: No

    Features and Specs:

    Listing Information:

    VIN: 1GT49NE74PF213471
    Stock: TK25650A
    Certified Pre-Owned: No
    Listed since: 02-28-2025

  • New Listing
    $53,990
    fair price
    $610 below market
    • 33,503 miles
    • No accidents, 1 owner, personal use
    • 6'10” bed, 6.6l, 8cyl
    • Carvana (In-stock online)
    • Home delivery*
    • AWD/4WD
    • Back-up camera
    • Bluetooth
    • Upgraded Headlights
    • Tire Pressure Warnin...
    Close

    Located in Charlotte, NC / 583 miles away from Bridgeport, CT

    At Carvana, we go miles beyond the extra mile. That's why we provide you with a convenient, fast, and hassle-free car buying experience that puts you ...

    AutoCheck Vehicle History Summary

    Accident Free Vehicle: Yes

    Personal Use Only: Yes

    History Provider: AutoCheck

    Title Details: Clean Title

    Salvage Vehicle: No

    Frame Damage: No

    Theft History: No

    Lemon Status: No

    Free History Report: No

    Features and Specs:

    Listing Information:

    VIN: 1GT49MEY4PF216731
    Stock: 2003658541
    Certified Pre-Owned: No
    Listed since: 04-25-2025

  • New Listing
    $62,900
    good price
    $3,530 below market
    • 42,648 miles
    • No accidents, 1 owner, personal use only
    • 8'2” bed, 6.6l, 8cyl
    • Freehold Dodge (86 mi away)
    • AWD/4WD
    • Back-up camera
    • Bluetooth
    • Leather Seats
    • Sunroof/Moonroof
    Close

    Located in Freehold, NJ / 86 miles away from Bridgeport, CT

    2023 GMC Sierra 2500HD AT4 10-Speed Automatic Duramax 6.6L V8 Turbodiesel 4WD CARFAX One-Owner. 10-Way Power Driver Seat Adjuster w/Lumbar, 10-Way Pow...

    AutoCheck Vehicle History Summary

    Accident Free Vehicle: Yes

    Personal Use Only: Yes

    History Provider: AutoCheck

    Title Details: Clean Title

    Salvage Vehicle: No

    Frame Damage: No

    Theft History: No

    Lemon Status: No

    Free History Report: No

    Features and Specs:

    Listing Information:

    VIN: 1GT49PEY9PF208514
    Stock: DU385140
    Certified Pre-Owned: No
    Listed since: 03-26-2025

  • New Listing
    $61,990
    good price
    $5,465 below market
    • 43,959 miles
    • No accidents, 2 owners, personal use only
    • 6'10” bed, 6.6l, 8cyl
    • Carvana (In-stock online)
    • Home delivery*
    • AWD/4WD
    • Back-up camera
    • Bluetooth
    • Leather Seats
    • Sunroof/Moonroof
    Close

    Located in Phoenix, AZ / 2,179 miles away from Bridgeport, CT

    At Carvana, we go miles beyond the extra mile. That's why we provide you with a convenient, fast, and hassle-free car buying experience that puts you ...

    AutoCheck Vehicle History Summary

    Accident Free Vehicle: Yes

    Personal Use Only: Yes

    History Provider: AutoCheck

    Title Details: Clean Title

    Salvage Vehicle: No

    Frame Damage: No

    Theft History: No

    Lemon Status: No

    Free History Report: No

    Features and Specs:

    Listing Information:

    VIN: 1GT49NEYXPF181120
    Stock: 2003756947
    Certified Pre-Owned: No
    Listed since: 05-29-2025

  • $49,830
    good price
    $2,876 below market
    • 46,489 miles
    • No accidents, 1 owner, personal use
    • 6'10” bed, 6.6l, 8cyl
    • Woodbury Chevrolet (24 mi away)
    • AWD/4WD
    • Back-up camera
    • Bluetooth
    • Upgraded Headlights
    • Tire Pressure Warnin...
    Close

    Located in Woodbury, CT / 24 miles away from Bridgeport, CT

    Bluetooth, Backup Camera, INCLUDES WARRANTY, NEW ARRIVAL, NEW FRONT BRAKES, GM CERTIFIED 172 POINT SAFETY CHECK PERFORMED, 6-Speed Automatic, 4WD, Bla...

    AutoCheck Vehicle History Summary

    Accident Free Vehicle: Yes

    Personal Use Only: Yes

    History Provider: AutoCheck

    Title Details: Clean Title

    Salvage Vehicle: No

    Frame Damage: No

    Theft History: No

    Lemon Status: No

    Free History Report: Yes

    Features and Specs:

    Listing Information:

    VIN: 1GT49ME70PF212697
    Stock: P0295
    Certified Pre-Owned: No
    Listed since: 08-01-2024

Showing 22 - 42 out of 346 listings

Consumer Reviews for the GMC Sierra 2500HD

Read recent reviews for the GMC Sierra 2500HD
Overall Consumer Rating
4.3 out of 5 stars35 Reviews
Write a vehicle reviewSee all 35 reviews
  • 5 star
    (71%)
  • 4 star
    (11%)
  • 3 star
    (3%)
  • 2 star
    (6%)
  • 1 star
    (9%)
4 out of 5 stars

Love the looks, love the power, love the economy

Rick B., 03/18/2021
2020 GMC Sierra 2500HD AT4 4dr Crew Cab 4WD SB (6.6L 8cyl 6A)
I purchased a 2020 Sierra 2500HD AT4 (Duramax) in November of 2020. This thing is a BEAST and a joy to drive. I've put almost 131K miles on it thus far and have not had a single issue. IMHO, the interior is better than a Ford but trails behind the Dodge. However, just because it seems less capable with technology isn't necessarily true. I have physical switches for many things that … the Dodge incorporates in their big screen. I MUCH prefer the switches because I don't have to go through electronic pages to find what I'm looking for. The seats are a bit hard but are very supportive. I'm averaging a 21mpg with it at this point but the majority (80%) of my driving is highway speeds. In an attempt see just how good of gas mileage I could get, I drove a cruise controlled speed of 55 mph on a VERY flat 2 lane road for a little over 75 miles. My results, 29.3mpg, yep, you read that right. As I get up to interstate cruising speed it's much closer to 22mpg. I have hauled my 6,000 pound boat a couple of times with it and it still gets around 14mpg. Speaking of hauling the boat, this thing tows like a dream. The cameras, mirrors and tow-haul mode work great and if I couldn't see the boat in my mirrors, I would hardly know it's there. The voice command menu and responsiveness is great, no issues with it and it has always recognized what I'm asking for. The Bose speakers produce more than I can listen to, and the cab is quiet enough for conference calls when I'm travelling for work. The in-cab outlet is perfect for charging my laptop on the go and allows my wife to use the computer when we travel without killing the battery. I put a hardcover on the bed but with the multipro tailgate I rarely have to do anything with it, and I make a LOT of trips to the lumber yard for 8'+ lumber. All I have to do is drop the upper portion of the tailgate and the long lumber slides right in and is safe and secure. One thing I would criticize. It doesn't match up when compared to the other makers off-roading capabilities (manual/push button locking differentials), but I didn't really buy it for that. If you want something to do some relatively challenging off-road cruising, look elsewhere. I could go on, but suffice it to say that I LOVE this truck and would absolutely recommend it without hesitation.
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Used 2021 GMC Sierra 2500HD in Bridgeport, CT Values

Estimated values
2021 GMC Sierra 2500HD AT4 4dr Crew Cab 4WD SB (6.6L 8cyl Turbodiesel 10A) with no options
ConditionTrade-InPrivate PartyDealer Retail
Outstanding$44,747$48,562$52,398
Clean$43,928$47,625$51,336
Average$42,563$46,064$49,565
Rough$40,788$44,034$47,263

The average list price of a used 2021 GMC Sierra 2500HD in Bridgeport, Connecticut is $60,000. The average mileage on a used GMC Sierra 2500HD 2021 for sale in Bridgeport, Connecticut is 44,342. Based on the average mileage of 44,342 for used 2021 GMC Sierra 2500HD for sale in Bridgeport, CT and using an average vehicle condition rating, which means the vehicle may have a few mechanical and/or cosmetic problems and may require a considerable amount of reconditioning, we appraise the average trade-in value of a used GMC Sierra 2500HD 2021 in Bridgeport, Connecticut to be $42,563.

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* Delivery of any kind does not apply to Alaska and Hawaii. Contact the dealer for delivery details, restrictions and costs.