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On my 10 mi commute, I find that my instantaneous fuel economy during steady state cruising once warmed up, is about 30-40% higher than my trip average. Commuting represents a large chunk of my fuel spent, so my tank average is well below my steady state cruising mpg.
However, the calculator is within 10% of my observed steady state cruising mpg, which tells me my estimates regarding actual BSFC, Crr, and CdA were pretty close.
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