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less power per volume of fuel injected (lesser energy density). But as one of bits of E85 tune is not just more aggressive timings, but also to inject more fuel per air volume, not sure it's right to call that it produces less power combusted, just if pitted against fuel volume. And it's not the only similar irony, everything is compromise, diesels due higher compression ratios are able to be more efficient per fuel volume, yet not that more efficient in cars in reality, as offset by heavier weight of engine for stronger construction to allow those higher compression ratios. Government choices in tax and environmental policies/regulations these days affect engine type efficiency more then they technically differ. And government is like casinos, it always win, you have no saying but obey and pay whatever they choose to push on.
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