Quote:
Originally Posted by N_Jay
Higher load requires higher pressure. Ambient temperature is mostly irrelevant.
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If you mean ambient temperature doesn't effect tire temp, that is partially true. The rule of thumb is for every 10F, you get 1 PSI; so not a massive change. Add to that temperature from friction under load of highway driving, you could see a difference when you last inflated your tires in early spring to mid-summer vacation, be it over or under a fuel efficient psi.
If you mean ambient temperature with regards to A/C usage, clearly you are going to use the A/C more with an ambient temperature of 100F outside verses 75F while driving.
In either case, they are part of the load on the motor and effect mpg.