Bought this in 2013 as a certified used truck from a Chevy Dealer with just over 20,000 miles. I drive it a LOT it's at 136,000 miles plus now. Trans fluid changeout at 75K I use full syn oil and average about 7500 miles between changes and it could go farther. Have used 4wd several times in dirt and snow tracks well in all conditions. Plugs changed at 99K with OEM AC Delco Iridium took about 45 minutes. Coolant change at 120K a low maintenance great performing truck at far less than a comparable Toyota. I only paid 25K including tax license and financing over 4 years. The traction control and abs work very well rear seat legroom is good. The other day a brand new 2018 Toyota wanted to race from a stop light in a 40 zone. He got me on the hole shot but by 3rd gear the DOHC gave me enuf to pass his new Toy by at about 55 LOL and he has the V6. Only mods are a K&N and 235 75 R 16 Hankook ATM's. That guy spent over 38K for his truck. I laughed all the way to the bank.
I bought a 2012 colorado crew cab used w/ 21,400 miles with the 5 cyl. 3.7L engine. The 4 cyl. engine was too weak, and fuel efficiency difference was only 1 mpg. Alone with luggage I get 24.5 mpg at 66 mph. With more ppl and luggage its more like 22 mpg. In houstons mix of highway and city I tend to get 19-20 mpg. It now has 60,000 miles and have had a $400 sensor go out. Ride and road noise are not the best, but livable. Turning radius better than full size, but not great. I find fuel mileage is significantly better than full size trucks, and I have had no issues with the drivetrain. This truck has no frills, but its reliable. This is the midsize truck to buy if you want value.
value, it is good enough without wasting my money.