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Originally Posted by Allch Chcar
The average EFI car can run upto 50% Ethanol before getting a CEL(Check Engine Light) from an out of spec condition depending on how much range the ECU is given.
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It will compensate to some extent, but that doesn't necessarily mean it'll run most efficiently while compensating for the ethanol in the fuel.
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Gasoline engines have been using hardened valveseals since the 60's shortly after lead was banned in all pump Gasoline.
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Obviously not always enough to be running E85 or LPG.
While some engines are perfectly happy to run on LPG or ethanol, that certainly doesn't apply to all engines.