I think the only time you shouldn't drive is when you're not going anywhere. When you're just driving in circles for the sake of it. Saying that, it's your car. You can do whatever you like.

Were I a multi-billionaire, and Master of the Earth, I'd invest a buggerload in the awesomeness that is the air-powered car. Bollocks to this crappy hydrocar arsechip. Then I'd ban combustion engined cars and use their skeletons for other things.

Like dominoes.