Here are some energy values of common liquid fuels. These use what is known as the LHV (lower heating value) - where the heat contained in the water vapor is not captured (water vapor condensed to water liquid). After all, when you burn gasoline in your car, the exhaust leaving the engine cylinder only contains water vapor, not water liquid.

Fuel LHV, Btu/lb Btu/gal lbs/gal

Ethanol 11,657 77,000 6.6
Octane (gasoline) 19,230 112,264 5.84
Hexadecane (diesel) 19,052 132,030 6.93
Methane 21,502 na na
Propane 19,774 82,458 4.17
Butane 19,506 97,608 5.01
Ammonia 7,992 40,581 5.03
Hydrogen 52,018 na na
Carbon 14,108 na na
Glycerol 6,930 72,823 10.51

If you want to convert to Btu's/dollar, just take the Btu/lb and divide it by the $/lb.

Nb41