To tell you the truth, I never really thought much of this replacing automobile transmissions as much as I look at it as something I can easily understand, repair, or even replicate for other uses like keith mentioned above. I first imagined a GEET setup used with this where throttling can be a problem. Most HHO systems have a throttling problem similar to the GEET and not to mention wind generators having variable speeds. I wonder if this could be implemented into electric vehicles somehow? Do electric vehicles use transmissions or are the all one speed?