One more thing. The generator would also be re-charging the batteries while the car is in transit.
He was a smart guy. And this was back when gas was less than 50 cents/gal.
Here is a link to what I consider to be a definitive analysis of why the kind of hydrogen projects currently under way are nothing but publicity stunts.
http://www.methanol.org/pdf/HydrogenEconomyReport2003.pdf
The authors of this 35-page report, even back in 2003, were as certain as I am that the fuel of the future that will replace the hydrocarbon fuels of today will be... manufactured (synthesized) hydrocarbons! Their favorite happens to be methanol ("wood alcohol", CH3OH), but they acknowledge ethanol, propane and butane, and octane (the primary component of gasoline.)
However, even after going through this report again, I do not think I would change ANYTHING I wrote earlier in post 7.