silverknight,
Thank you for your informed and reasoned post.
What you are saying matches my impressions from the video on youtube. I should rent the whole dvd.
I was also remembering the 5% value for hydrogen.
Are you under the impression from reading the book that you could remove the throttle body completely, and then control the engine power/speed by first, always feeding an amount of hydrogen that would let the engine just idle, (if you added no gasoline at all) and then second, adding gasoline from the injectors to increase the engine speed/power as needed? Because that is the impression I get from the video. If my impression is correct, then it seems an engine ECU would be (almost???) un-needed, you could just have a box that pulse-width-modulated the injectors, and the control knob to set the duty cycle would be attached to the gas pedal. There would be no need to synchronize the fuel injection timing like is needed on a diesel engine.