Fuel having a high ´natural´ cetane number obtained through high energy paraffin content may provide better fuel mileage than lower energy fuel or fuel with poor natural burning characteristics plus a cetane improver, if ambient temperatures are adequate to prevent gelling of the high paraffin fuel.
Due to ethanol´s lower energy per unit volume, it should take more fuel to maintain a stocheometric (perfect) air/fuel ratio, which all newer vehicles will attempt to do (closed-loop fuel control being pretty much standard for the last 20 years).
For every 10% ethanol added to the fuel, a mileage loss of 3% should be expected.
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