[Christ]

Pennsylvania's average price is 9.88 C/KWh.

The BTU content of any fuel is the maximum amount of potential work energy it has to be released, converted to any other form. For instance, if you light a fire, and 30% of that fire is light energy, and the other 70% is heat energy, assuming you're burning 100% of the potential fuel value, the light plus the heat energy values should equal the BTU value of the fuel you're burning.

40 BTU/g for hydrogen is derived by using the gallon volume of uncompressed hydrogen gas (in gaseous form) as you would get it from a generator.

126,000 BTU/g is the fuel value for average industrial gasoline, I believe without regard to additives.

Hydrogen can be compressed because it is a gas. When compressed, it will become liquid. As it expands again, it goes back to being a gas. Liquid hydrogen has a much higher BTU content per gallon volume.

The BTU value of the fuel is only important if you consider the H2 a replacement for the equivalent amount of gasoline, as far as I can tell, but there is a point to be made. If you're depending on the hydrogen solely for combustion enhancement, there needs to be a HUGE amount of enhancement going on to get a gain from it, due to the energy cost to derive it.