STOP COMPARING E85 TO REGULAR GASOLINE!

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E85 outperforms any fuel available at the pump. E85 fuel rating is 105 octane, regular gasoline fuel rating is 87 octane, midgrade gas is 89, and premium fuel rating is 91 or 92. E85 is a far superior fuel and should be compared with premium gas pricing. E85 is not only comparable to Premium fuel it actually outperforms the premium gasoline rating in all catagories.

The octane fuel rating is a measure of the resistance of gasoline and other fuels to detonation (engine knocking) in spark-ignition internal combustion engines. High-performance engines typically have higher compression ratios and are therefore more prone to detonation, so they require higher octane fuel. A lower-performance engine will generally perform better with high-octane fuel, since the compression ratio is fixed by the engine design.

The octane number of the fuel rating is measured in a test engine, and is defined by comparison with the mixture of iso-octane and normal heptane which would have the same anti-knocking capacity as the fuel under test: the percentage, by volume, of iso-octane in that mixture is the octane number of the fuel. For example, gasoline with the same knocking characteristics as a mixture of 90% iso-octane and 10% heptane would have an octane rating of 90.[1] Because some fuels are more knock-resistant than iso-octane, the definition has been extended to allow for octane rating higher than 100.