I believe all modern cars have an antiknock sensor in the engine for emissions management.
If so, the engine can advance the timing to get more power and higher gas mileage within whatever parameters the manufacturer allows.
Ethanol raises octane but has 1/3 less energy per gallon. Detroit will have to make gas tanks 30 to 40 gallon size to get the same between fillup mileage. And I sure don't see E85 selling for 1/3 less!!
Thanks but no thanks. I'll stick with pure gasoline.
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