Originally Posted by terryknight
believe what you want. JJflash gets well into the 20s with his 4x4 5 speed, wih 3.55s, my father gets' 23 with a bone stock 2wd auto with 3.55s. i know a guy with exactly the truck you described, bone stck gets 26-27. my modified 94 with 4.10s, will get 22 all day long. (all of these are highway numbers)
Claim what you want.
I know setting the cruise at 55 going on flat highway with no stops the best I ever saw was 18...on summer fuel....when the temp outside was right around 60.
Those are hand calculated numbers resulting from miles traveled divided by fuel pumped in.
These are not economy cars. 20 is pushing it under ideal conditions. Anything above is not believable without modifications driven towards fuel economy. Anything on the down slope to 30 would be asinine to believe, especially out of a stock truck.