deerefan
Veteran Member
I bought a 2011 Z71 4x4 ext cab in December. It has the tow package and 3.42 gears with the 6 spd auto. I have about 5500 miles on it and am averaging 15.8 mpg hand calculated. I find this rather disappointing considering my 97 F150 4x4 ext cab with the 4.6, 4 spd auto and 3.55 gears get 15 flat. Here we are 14 years later and light years ahead in technology and the mileage is basically the same. I can't call GM a liar as it states 15-21 mpg on the sticker and I am getting 15.8 (the computer mpg says 16.3 avg). For comparison, my father has a 2010 avalanche, 2wd 3.42 gears and he is seeing 18-19 mpg. I drive normally, not lead footed. Another thing I noticed is at 62 mph, I am turning the same rpm as my ford. Weird considering my trans has 2 more gears than the ford. Anyone have the same truck? What mpg are you getting?