Quote:
Originally Posted by Volk Z
You will get better mpg with 40psi but a little rougher ride
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The 0.07% difference in your gas mileage for pumping the tires up +13psi is not a valid reason to over inflate your tires. A real reason to not do it is that the ride goes to **** and your handling is impaired.
Debunking a Mileage Myth: Can You Really "Pump Up" Your Fuel Economy? - Popular Mechanics
A general, good rule of thumb, for almost any car is to fill the tires up to 32-35psi.