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Subscribe to this threadBMW 520d beats Prius in gas mileage
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psarhjinian @ Mar 23rd 2008 3:59PM
@Duncan:
"Diesel contains about 10% more energy by volume than gas and therefore produces about 10% more CO2 by volume when burned."
Just to clarify: diesel contains more energy because it weighs more. It weighs more because it physically takes more crude oil to make a gallon of diesel than a gallon of gasoline: depending on estimates, it's between 15-25% more crude per gallon.
Then there's the high-strength block, high-pressure injectors, turbocharger and emissions control system. Granted, not quite as complex as a parallel hybrid, but not as simple as a naturally-aspirated gas engine, either.
Compression ignition is a good technology, but I think there's a bias amongst gearheards towards diesel, and it's one that conveniently glosses over the true fuel requirements and complexity inherent in a modern TDI.