the problem with the low ethanol blends say e10 e15 is that they MAINTAIN the same octane as regular unleaded. this is why they are cheaper. the only way you can stay around 85 octane with 15% ethanol is if you start with low grade gasoline. they use cheaper fuel then mix it with even cheaper corn fuel and you ed up with an 85 octane gas with less eneregy than standard 85.
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