[QUOTE="Bob"] You're preaching to the choir, buddy. I am a big fan of diesels in certain situations. They are heavy (low specific power), but this is can be offset by efficiency and power characteristics (namely, torque).[/QUOTE] This is less true for turbocharged diesels. [QUOTE] We must be cautious about diesel fuel itself, because it takes more oil to make a gallon if diesel than to make a gallon of gasoline. So in the end, diesel will cost about the same per BTU as gasoline. I don't get why hybrids don't use diesels. Seems to me that would be a killer 1-2 punch. Electric motors supply great acceleration that diesels lack, the diesel excels at economical cruising which is the gas burner's weakness.[/QUOTE] One big reason is pollution. European diesels are just now coming under reasonable pollution standards. These will cost some fuel economy, but they should still end up 20-30% better than gas engines, although the DI gas engines under development now may change this equation. Matt