Quote:
Originally Posted by Sid 6.7
Trip #1
Exterior Ambient Temp = 70
Mileage = 43.8mpg
Trip #2
Exterior Ambient Temp = 90
Mileage = 40.3mpg
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Dont know if anyone has mentioned this, but the A/C would run more in higher temperature to maintain cabin air temp... also your engine becomes slighly less efficient at these higher temps due to less dense air... especially for a naturally aspirated car.
If the temperature was the same, the MPG difference would have probably been less than 2 mpg.
That said, 34 PSI is already pretty well inflated, so boosting it to 45 would probably result in a minimal difference anyways, much less than say 20 PSi (where there would be noticeable sagging) to 34 psi.
Just to what the owners manual recommends to keep wear on the car itself to a minimum. If you over inflate your tires they will wear faster and could develop bulges where you cant see them, and after 15,000 miles or so cause a blow out... (HAPPENED TO ME!)