Resistance to change is always the biggest obstacle.

What oil companies don't want you to know is that refineries use a huge amount of electricity in refining gasoline. And that's usually not even figured into reports about gas cars' overall energy use.

I like to take folks back to the turn of the century when people said 'gas cars can never replace horses because you can feed horses at your house, you get along with them, they're nice.'

There are not a ton of people buying cars - cars are expensive. So people usually go for the cheapest car they can get. And if the price of gasoline falls again, it makes the savings that you get with an electric car harder to realize.

Obviously the horse can still do things that the gas car can never do, and the gas car will always be able to do things the electric car can't do. But they have really different uses and advantages.

I think electric cars can help save Detroit. They reflect good decision-making, and there has been bad decision making in the auto industry for so long, in my view.

I'm sure the gasoline companies would love to keep their 100 percent monopoly on transportation fuel.