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Well I just may understand it better than you think. Only 30% is making POWER, that is burning and expanding during the part of the cycle that can put power to the crank, and that is about 70% of the down stroke of the piston from top dead center.
Granted another 40/50% is still burning though bottom dead center and during the returning up stroke of the piston and though the exhaust cycle and still burning on its way out the exhaust port, pass the exhaust valve and into the exhaust manifold.
Which is one reason ICEs get so damn hot the exhaust temps can run in the 1000s of degrees and the exhaust manifold runs very hot.
I have seen test bench runs of an ICE at full throttle where the manifolds and exhaust pipes can glow bright red with the heat.
NOW IF we can supply pure vapor it is said it will not need any lead time (zero advance timing) and will burn very fast and will have produced power for the 30% of the real power stroke and be completely burn out at that point. This very fast burn of only the 30% of fuel in the 30% of the real power stroke from top dead center to say 75% of the down stroke can produce just as much power with no left over waste of burn fuel.
SO if you get the same power with fast burning vapor you only need say 30% so you get much better MPG by not using the other 70% of normal fuel use/waste.
GET IT???
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