[chuckm]

Yo, homey, I've never suggested that you buy a natural gas car or convert one. Let's go back and follow the thread. First, I said, "Actually, it is much more expensive than the currently most popular means of industrial hydrogen production: cracking natural gas." Your responded, "only if you ignore the cost of the natural gas which is HIGHER THAN GASOLINE." I then proved that you were incorrect regarding the relative costs of gasoline and natural gas. I'm simply trying to point you toward the only economic source of H2 for a car: bring a bottle onboard. That's been my point all along.

If you are absolutely deterimined to stuff an onboard electrolysis unit into your vehicle, by all means go ahead. The gains will forever be outweighed by the cost required (ROI is negative). I strongly suspect the battery weight will actually eat whatever mileage gain you would have otherwise gotten. Hence my offer of a bottle system design. You could install something that weighs, at most, 1/5th of your battery-based system. You'll have no recurring costs of replacing battery packs.