Reply #21: A couple variations on that idea

[Ready4Change]

There's an electric car that was floated a year or two ago called the T-Zero. It was similar to the Tesla in that it was performance oriented pure EV. But a neat thing it had was a trailer it could tow, which was a portable gasoline powered generator used to charge the batteries as you drove on long highway trips. What I liked about that was that, if the prevelant type of available fuel changes all you'd need would be a new trailer, rather than a whole new car.

Another varient is a mostly pure EV, but with a modular generator pack that acted like the T-Zeros trailer. Being modular, you could swap it for a different unit if fuel availability changes.

With either of these, you've got a potential route whether the post gasoline fuel is propane, NG, Ethanol, biodiesel, hydrogen fuel cells, etc... Just swap the generator unit.