I think you'd be better off putting a small motor that draws 10-20A on your accessory belt to assist your engine than doing something with HHO. That or as Ecky suggested a dc-dc converter to boost your ignition voltage back up.
I've had alt deletes on a few of my vehicles, all of them have shown improvement from it.
BTW what are are you driving?
The thing with hydrogen is it really isn't that beneficial at all at stochiometric air/fuel ratios on a gas engine. Once you start leaning things out, the mixture burns slower. Adding the hydrogen in speeds that back up a little bit. However, you need to be able to tune your car to see that difference and it probably needs to be done on a dyno to get any tuning consistency. That just isn't practical for most of us.
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