Twenty years out is hard to predict. I mean, if you're asking me, I would say that on a per energy basis, natural gas will still be a lot cheaper than gasoline or diesel. That's my personal projection, but I'm not an oil industry expert. But what I do know is that we have an enormous and a growing demand on oil. We do not have a lot of ability to pump a lot more out, so the supply is not going to grow so fast and the economics will force the price of oil-based products to continue to rise.
With natural gas, currently, the supply is growing faster than the demand, so there's an enormous downward pressure on natural gas and it's expected to be relatively stable or low, according to articles that I've read, for five to 10 years out. Beyond that I can't comment.