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With our 12.5:1 compression, we decided early that E85 is a far more efficient fuel to use than dedicated race gas. But we also wanted to try some of Rockett’s new race E85 fuel, and with this convenient 55-gallon drum, the decision was made easy. Rockett’s race E85 has an even higher octane rating of 112 versus typical pump fuel of around 105. Plus, the motor-octane rating is significantly higher.