I promise the ECU will compensate for the extra 5 percent of ethanol content. We are already on e10. e15 will not do much worse. Actually, if our cars were boosted, it would help. Also, the ECU will be able to compensate for closed loop operation. The o2 sensors will pick up the swing in fuel and adjust accordingly via the fuel trims. This is where the gas mileage gets a little worse. WOT might lean out a hair, but that can be a good thing. Emphasis on "can", depending if your car has already been tuned or not.
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