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It seems to me that, all other things being equal (aerodynamics, etc.) except for weight, the simple fact is it takes more work to move the extra weight. It takes more gas to do more work. All this stuff about extra glide distances doesn't come for free. It takes the extra work to get the extra glide. And since the real world isn't perfect, there's plenty of inefficiency in the engine working and the car gliding. Under some conditions, the glide side may show an advantage, but overall, day in and day out, it takes more work to move more weight, and the lighter car should get the better mpg.
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Darrell
Boycotting Exxon since 1989, BP since 2010
Have you ever noticed that anybody driving slower than you is an idiot, and anyone going faster than you is a maniac? George Carlin
Mean Green Toaster Machine
49.5 mpg avg over 53,000 miles. 176% of '08 EPA
Best flat drive 94.5 mpg for 10.1 mi
Longest tank 1033 km (642 mi) on 10.56 gal = 60.8 mpg
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