what are you guy averaging for mpgs, i think one of my spark plugs is miss firing but the check engine wont come on so i cant find out witch one it is...... and the f150s give me a lot of grief
but i think right now im at like 13.........

 

thats right on with a heavy foot.

if you drive it like a truck you can get up around 16.

 

i got a screw with heavy 22s but i have a programer and exhaust to help so i get about 14 mpg

 

10-11 mpg avg.. but I'm rolling 37s and live in the mountains.