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The absolute best for passenger cars I'm aware of was the engine in the Insight/3L Lupo at ~40+% BTE. 48% is better than maximum efficiency for a non-road diesel, and those have no emissions equipment. They're assuming they can see marine diesel efficiency in a car. Crazy talk IMO. Even if they could, 2+x's the mileage implies they're using a car w/ roughly 50% of the weight/CdA, which is what, ~1450+lbs? There's no way. I don't think going in new directions is a bad idea, but at least keep it within the realm of the possible.
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