Quote:
Originally Posted by Monterra
... As for MPG I find that if I'm driving locally with AC- pretty big 2-3+ mpg, highway cruise AC on vs. windows open for me equates to little if no change- I can still easily get my coveted 30.1 on the indicator. Why does it go in varying steps of .2 to .6? AC on (hot day) driving back roads spritely is the one instance I have turbo envy in which case I turn it off and sweat it out if I'm by myself.
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I read somewhere that under 50 MPH or thereabouts driving with the windows down and A/C off gives the best mileage, but above that reduced aerodynamics takes over and you're better off with windows up and A/C on.