How much of an increase in mpg can I expect with overinflated tires?

[Ernie Rogers]

Originally Posted by Minger

I'm still stumped as to what I should set mine as, both the manual and tires say a max of 35...maybe I'll try 40 next time I fill up?

I use 40 psi (44 sidewall) because it's usually cool when I set the tire pressure and I don't know how hot it might be later-- unless I'm in a competition.