Good question. You MIGHT even want to use less.Originally Posted by VXorado
More seems to improve MPGs -- like you'd expect. Less probably gives the better ride. I've also run less with the vette. Figure it's better to enjoy the car and ride (loosing some tire life) than getting best mpg's possible.
I'm running 285/60-20's. Maybe a hair less sidewall height that OEM. They made the ride a bit harsher than the fluffy 285/70-16's that I bought it with.
With the former, 35psi felt about right and I got better mpg. 35psi is a bit too stiff now that I have shorter sidewalls. So really, that's probably the biggest indicator vs the overall size.
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