[bubba428]

ok...your measuring power output of the actual burning...thats not how it works in an engine...cylinders and piston work off the explosive properties not the heat emissions. what if there was a fuel that could explode 50X its volume in a combustion cycle and only produce 1BTU/h. are you saying you would need more of that? heat is a byproduct of combustion, we all know that, internal combustion engines do not run off heat now do they, the run off the explosive expansion of a compressed vapor.