Fuel Density

... Because no one cares about moles in the real world.

Energy density is the energy given out when 1 Kilogram of a certain fuel is consumed.

E.g. Ethanol is C₂H₅OH = 46

Delta H = -1367 Kilo joules per mole (Based on a calorimeter experiment)

Delta H = -1367/ 46 = -29.717 Kilo joules per gram.

Delta H = -29.717 x 1000 = -29717 Kilo joules per 1 Kilogram