Tackle

3.5k is real high. Could be a vac leak or possibly IAC.

jakez

i havent adjusted tire size. i will do that though. i have 365/75/16 what should the tire revsmile be? and [MENTION=118772]Tackle[/MENTION]. thats what i usually do.

Tackle

Assuming you meant 265, it could still be off depending on what was stock as that is what the pcm was programmed at.

So what do you get for mpg when you calculate it?

tansupercrew

These suggestions are correct but also i wonder just what kind of "big" bumper you have. Heavier and less aerodynamic could be factors as well as the others some have suggested could be a combined lower mileage. Do you have electric fans? I gained 2+ mpg from that...
You definitely want to figure out exact mpg, also i would average over at least 2 tanks as well.

jakez

i have a 5in lift and the tires are as big as 35s but there not 35s. and i have a bumper like iron cross bumpers. and im gonna finish the tank i have right now and see what i get.

Tackle

That certainly does not help mileage. You have 3.55s?

jakez

yea no kidding lol. and i honestly dont know. but maybe if this will help decideing what gears i have. on the freeway i can go 65mph at 1600 rpm

Krack499

iTrader: (1)

What's your door code for your axle and what's your stock tire size