I put more air in my tires and gained 2 mpg. I went from 16mpg to 18mpg mostly city driving.

Those 16-18 mpg sounds about right... I wouldn't think you'd get much more than that as long as its stock. I've heard good things about the K&N air filter tho... that might boost your mileage. Otherwise, yeah... my (current) daily driver is only getting 13-14mpg. But you love on 'em anyways, right? :)

What psi are you using?

What psi should i have my Michelin Cross Terrains at? They are all at around 29-30 now. Should I raise them up to around 33?

32psi is standard but I run my Nittos at 35psi.

I run my good years at 60psi the max on them is 65psi cold, look at your tires to make sure. The psi is the fastest gas robber besides a clogged airfilter or even worst a clogged fuel filter..

I run 33 Mud Terrains at 35 psi... still get 14 mpg in the city

I guess I will do 33 psi tonight, my max is 35 psi

started running my "street" tires (32" a/t's) at 35 psi last tank full....

I just jumped up to nearly 17 mpg!

aaron

whoa... on the 3.4 you got 17mpg? Not too shabby... My mileage is steadily coming up, now at 15mpg after some concentrated fuel rail/injector/ everything in between cleaner... but still w/ 33x12.5's... how silly my truck would look with conventional tires.... but with gas at $2.68 a gallon, well, I might make the concession...

well, i *did* say "NEARLY" 17 - it's like 16.8 ...so...round up! And this was BEFORE I cleaned out the MAF!

and yah, going back to metric 32"s that are a/t's looks REEEEEALY lame compared to my 285 m/t's....but...saves the duckets. Saves wear on the m/t's too :great:

aaron

Doing the formula I'm getting 18 1/2 mpg consistantly.....except the first week I did the ISR mod-17 that week. Prior to the mod I was getting 19+ but oh, that noise! I do about 30/70 highway/city driving.

I have Michelin LTX M&S on mine currently, no lift, pretty much stock.