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Old 12-28-2012, 11:50 AM
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In natural aspirated applications, a non-ethanol gas burns more efficiently because it has a faster burn wave and ethanol requires a higher ignition temperature to burn, so it really is a later second burn wave in the chamber. Also, ethanol has a lower BTU rating compared to regular gasoline, which means it requires more ethanol to create the same amount of power as regular gasoline.

That said, since your injectors are factory scaled for regular gasoline you'll see a decrease in mileage because you're replacing 10-15% of the regular fuel with a slower and less volatile fuel, so you won't make the same power per combustion cycle.

If you run forced injection, scale injectors, or tune specifically for ethanol, then you can advance timing a lot more compared to regular gasoline because of the slower burn wave, which means less potential for detonation/pinging.
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