And just an additional note on this: Wind drag plays a big part in mpg, especially at higher speeds (50-60 and up). Note that drag from air resistance increases as the SQUARE of the speed -- not a linear function, so that's why mpg is better at lower speeds (up to a point -- engine efficiency plays a part, too, and I suspect best engine efficiency is in the 45-55 mph range, though I have little data to corroborate that, other than experience).
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