Im running some toyo a/t's 31x10.50/15s right now and I was curious to how much of a difference going up to a 32x11.50/15 would make gas mileage wise. My 3.0L already sucks it down pretty well with the 31s...also would it cause any more wear and tear on the suspension?

 

It will affect gas mileage and will wear more on the suspension. But how much depends on how you drive.

You may not notice much of a difference going from 31's to 32's in the power and gas mileage department. But you could always regear if you wanted.

And the weight and how you drive will be the big factor in your suspension wear and tear.

 

Depending on the tire, you're probably adding about 10-15 lbs to each wheel. With the 3.0, you'll probabaly notice the difference. What gears are in your truck? 4.10?