If you hear people talking about E85 like it’s some sort of magic bullet, that’s because it kind of is.
E85 is, of course, the high-ethanol blend of gasoline available in many areas of the country. Its elevated ethanol content makes its relative octane rating extremely high, which in turn means that it’s highly knock resistant.
The downside is that the ethanol blend actually has slightly less specific energy content than gasoline, so you have to use a lot of it–flip ahead to this issue’s Fuel Tips for more E85 talk. But that downside also comes with a hidden upside: Because of the additional volume of fuel, combined with the natural latent heat of evaporation properties of ethanol versus gasoline, E85 typically also lowers engine temperatures. And although you need to use about 20% to 30% more E85 than gasoline (don’t forget that the E85 makes more power than gasoline), it’s wicked cheap in our experience–cheap enough to warrant the benefits,…
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