The International Open Source Hydrogen On Demand Builders Network.
Just a point of order to clarify:
It's called an oxygen sensor for a reason - it senses the amount of oxygen in the exhaust! If there is too much oxygen, the computer compensates for that because it thinks "if there's too much oxygen, there isn't enough fuel to be burned with it; I must maintain 14.7:1 according to the MAF/MAP!" and sends MORE fuel in attempt to compensate, regardless of how well the engine is running. An EFIE tricks the o2 sensor into thinking that it is sending exactly the right amount of fuel because the amount of oxygen present in exhaust is "perfect", so it must all be getting used up in oxidizing (burning) the fuel.
PWM - the amperage is still there, but it's not a constant drain on the alternator (don't you get burned out quickly when someone is constantly demanding the most out of you, too?). I should think you can also better control gas production using one...maybe even use circuitry to step up the "12v" from the alternator to something stronger, making for more gas per pulse???