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Old 11-10-2014, 11:14 PM   #23 (permalink)
free radical
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Quote:
Originally Posted by mada88 View Post
Hello everyone,

I used to own a car with 17 inch wheels and in the owners manuel it said that 38 PSI was the best pressure for economy.

I now own a car with 15 inch wheels and I have been over inflating all 4 tyres to 38 psi.

I 38 psi optimum for fuel economy? making the tyres have more rolling resistance with a higher psi?

What is the optimum for a 15 inch tyre?

I saw a myth busters episode and they said 30 psi was best.

Or does it depend on the wheel and tyre size?

Any help is much appreciated thank you
I'd use whatever is maximum pressure posted on the sidewall of the tire,using more would be probably improve mileage but also make the car ride harsh and reduce the tires life span,wear it out faster in the middle!
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