I want to put some bigger tires but dont want to lose a whole lot of gas mileage. I know that there will be a drop but I just dont want to lose to much (gas prices are out of this world!!!)

Have
255/70/16's

Thinking about
265/75/16's

 

Ooh rah Marine.

I've heard that going with a little bigger tire can help the mileage a bit.. effectively less turns per mile.. But then going too big in tire/wheel combo can reduce the torque, and that can decrease mileage..

So there's middleground to shoot for.. I think with 265's though you'll be fine.. mileage might be the same or a little better..

 

You shouldn't see too much of a decrease in power by going to 265's, thats what I have on mine. Although I never had the stock tires, bought mine used with 265's already on it.

You will need to get your speedo corrected though.

BTW, the main reason you lose mileage with bigger tires is because they are heavier. Heavier rotating mass = more work for the engine to put down.

 

265/75R16's will work great, assuming you have 3.55 gears (most likely), or 3.73. 265/75R16's are almost identical in diameter to the "Off Road Package" size of 265/70R17.

With the larger diameter tires you may notice a slightly doggy feel on acceleration. The effective gear ratio is reduced, thus the engine RPMs will be operating lower in the power band.

With larger diameter tires you may also notice braking is a bit more sluggish. The brakes/rotors will have fewer revolutions to stop the truck in the same distance you are used to.

All in all, the up size is a good move, and if you keep your foot out of the gas, you will see a slight increase in gas milage.

 

Thanks Fellas. Now, what Brand????