4.5 MPG loaded, 12 MPG empty! Duramax with Allison automatic transmision is a joke! Low power, worse fuel economy! This was by far the worst value for my money since I started buying vehicles in 1986! Will soon be selling this pile of junk for a more powerful, economical gas rig! I loved Chevy trucks until I bought this hunk of junk. You can't even start up an incline loaded without using low range 4X4! Forget quick take-off! Imagine 25 MPH uphill in the Rockies for miles and miles! Yes, I bought it brand new, had it dealer serviced right on schedule, all the updates they had, etc. and still no performance!
This is a work truck and a daily driver. I tow a 7500 lb trailer 300-700 miles per week and it does the job. Mileage: 10 mpg w/ the trailer, 15-17 mpg w/out. Dealer performed all service Duramax diesel head gasket failed at 118k miles. Even after months of negotiations GM REFUSED to honor the Warranty! The repair cost $7500 out of pocket! I CANNOT recommend GM to anyone EVER again!
I am very disappointed with my purchase of the Chevrolet 4X4 crew cab 3500 pickup. I am towing about 8000 lbs on a regular basis and traded a 2004 Toyota Tundra for the Chevy. This truck rides okay when not towing, but hook a 26' trailer to it and the ride is so uncomfortable you have to pull over every hour or so or it will beat you to death. It averages 7-9mpg and seems to top out at 60 mph on slight inclines. The Tundra by far is a better vehicle more leg room and the overall package is 100% better than Chevrolets "best towing truck" It is too bad as I have been a long time Chevrolet owner but this will be the last.
We mostly use our truck to pull a 30 foot Cabin cruiser boat. It has proven its self over and over again, pulling a 11,000 pound boat up some very steep,and wet boat ramps. We also pull a 25 foot camper with it. If we hadn't hooked it up and did't see it in the rear view mirror, you would never know it was back there. Our truck has proved to be every thing we had hoped for in a truck. All though a might harder to park than our Blazer, my wife had rather take it shopping.she likes the way it puts her up higher than most vehicles.