Want better MPG?

Air your tires up to the maximum.

In an effort to fix my TPMS light that never turns off, I tried airing down my tires to the door jam recommendations. (It should be noted here I'm running Michelin LTX M/S at 35 PSI max)
After doing that my MGP suffered horribly. I believe it's supposed to be 29 and 27 PSI for the door jam. Whatever it is, my gas consumption grew. I've lost easily a good 30-50 miles off a single tank of gas compared to what I normally get.

Try airing your tires up to the tire maximum for a tank of gas and see if you improve at all.

Just be careful with the back tires cause from driving for the past year and a half, I have noticed just a little uneven wear on the back two tires from them just barely bulging due to no weight in the back of my truck generally. If you run a big enough tool box or a shell I can't see if being a problem.

 

Thats not a good idea.....You sacrifice handling capabilities of the tires and they will wear un-evenly.

 

After loading and unloading my truck with the tires aired to the doorjam, I found I prefer the higher PSI. And I keep tabs on my wear on my tires. Like I said, max PSI is 35 which is what I have the front two at. The back I have at 32ish now. 35 was causing a little (And I mean little) uneven wearing.

As for handling, no issues. Been driving for 1 ½ years with them aired up that much, and no issues. Only had on accident and that's cause I accelerated on a turn while changing lanes on a bridge in winter.

(Yeah I'm dumb...)

 

Krazie- What you can do is make whiteout or paint marker lines across the tires. Drive the truck around the neighborhood and monitor wear patterns. I ended up airing my front tires to max psi; 35 cold. I drive empty, by myself most of the time, no cargo etc... 30psi cold. This gives me optimal wear and fuel economy. Which is the $$$ sweet spot. I'm on stock rugged trails and whatever wheels come on the TRD-OR. Averaging 18-19 mpg combined of city & back country roads.

 

You can do that sure. Myself, I just checked the tread depth on both sides and the middle of the tire. I found for the rears 35 was a little too much as the depth in the middle of the tire is maybe a millimeter or two less than both sides of the tire on the outside.

But the gas savings are ridiculous. I'm just curious as to how many people air their tires to the door jam or the tire manufacturers spec.