Here is a good article, 2002, but the facts about the energy density of the fuel are constants.
relative energy per liter: Diesel=1.00, Gasoline=0.87, Propane=.64, Ethanol=0.56, Methanol=0.46
This has the most direct impact on mileage - energy per liter
http://www1.eere.energy.gov/vehicles..._eberhardt.pdf
relative energy per liter: Diesel=1.00, Gasoline=0.87, Propane=.64, Ethanol=0.56, Methanol=0.46
This has the most direct impact on mileage - energy per liter
http://www1.eere.energy.gov/vehicles..._eberhardt.pdf
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