Quote:
Originally Posted by UFO
But to me it's utterly non-comprehensible. Ethanol is a fuel with 75% of the chemical energy of gasoline. I am not aware of any mechanism that can account for such an effect.
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My older vehicles that were not tuned for ethanol get terrible FE on e10 because the timing and the o2 values are completely wrong, some older vehicles would sense the o2 value being off and pour in way more fuel than would be necessary and actually go rich.
Stupid but true unfortunately.