Found the approximate energy densities by Googling around:
Gasoline - 47.2 Mega joules/Kg
Black powder - 3 Mj/KG
Smokeless powder - 4.6 Mj/Kg
Gasoline varies by +- 4% and powders will vary some according to composition.
The density of gasoline is about 6.15 lb/gal so if my math is correct it takes about 63 bl of smokeless powder to equal the energy content of one gallon of gasoline.
Sooooooooo about .5 grn of 87 octane for a 45 acp when compared to a titegroup load of 4.6 grn that would be a lot of rounds out of a gallon of unleaded!
Hey, hold my beer..................
