
Re: Facts By Dave
"There is no way that you can recover a weight of water from the exhaust gas of an engine, that will balance out the weight of fuel consumed, unless you are burning a fuel that contains way more Hydrogen than Carbon, and/or is lighter than air in itself."
This rather depends on what you consider "way more hydrogen than carbon". Methane is one extreme, and burning 16 grams of methane gets you 36 grams of water. Oils and fats are essentially (CH_2)_n, and get you 18 grams of water for every 14 grams of lipid. But I suppose by atoms they still have more hydrogen than carbon. Burning benzene will only get you 54 grams of water for every 78 of fuel, so /technically/ I suppose you're correct, but pretty much any fuel that's not coal will contain more hydrogen than carbon anyway.