The use of cetane improver also helps to maintain acceptable fuel mileage.
I purchased a 2005 bonneville gxp, and the fuel mileage sucks.
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).
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