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I agree with pretty much everything that's been said. The biggest factor is the cycle/compression ratio. Throttling is big too. Just to add a few things.
Diesels (typically) run at slower rpms as well, so there's less friction. Also, most modern diesels are turbocharged so it allows for the recovery of some of the exhaust heat.
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Diesel Dave
My version of energy storage is called "momentum".
My version of regenerative braking is called "bump starting".
1 Year Avg (Every Mile Traveled) = 47.8 mpg
BEST TANK: 2,009.6 mi on 35 gal (57.42 mpg): http://ecomodder.com/forum/showthrea...5-a-26259.html
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