MPG difference bewtween rim sizes???

Looking to buy new tires and rims. Planning on getting a set of 285/70/17 or 285/70/16. What I want to know is how will the one inch rim difference effect my MPG??? Thinking about getting a set of Hankook dynapro ATM's. Also, I have 5100's all the way around my truck, with fronts set at 2.5 and a 1.5inch aal in the back. Any info helps, thanks

 

arguement1: larger tire lower rpm = better mpg
alternate arguement: engine works harder on larger tire size lower mpg.
The only real proof would be to drive both and see. I think the 17" would be around .25mpg less if i had to give my best guess base on just a bit heavier tire and rim, i sure cant prove it though.

 

You bought a truck, dont worry about it!

 

i though it was mostly the mass that a larger tire has vs a smaller tire?

 

It is not the rim size as much as the tire size, 285,s are going to cost you some mpg.