[poundwise]

Good information! The only potential flaw I see is that A/C on, windows up v. A/C off windows down test. While it may not make any difference at higher speeds, it would seem to me that it certainly would at lower speeds. The drag created on the vehicle at higher speeds with the windows down negates any savings gained from having the A/C off. However, at slower speeds, this drag is less and therefore some additional fuel economy should be gained. Regardless, I do not think this is a major factor anyway. To stop accelerating hard and mind your speed is likely the number one tip overall.