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Would not the ideal flame front speed be directly related to piston velocity, which is a function of stroke length and RPM, which are easily modifiable design parameters? Again, I would think that a gasoline engine that benefits from a faster flame front is simply not fully optimized for the flame prorogation rate of gasoline - which most all modern gasoline engines should be.
I've seen some calculations there suggest the theoretical maximum thermodynamic efficiency of any OTTO cycle ICE is around 46%, and both Honda and Toyota have exceeded 40% without direct injection. That really doesn't leave a lot of room for HHO to improve things in an already well-tuned engine.
However, I'm not a mechanical engineer, I just know what I've read, and how I've interpreted things could certainly be erroneous.
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