That's a good question.
In North America, the only pure natural gas vehicle I'm aware of that's being sold today is a Honda, I think a GSX or something like that. There are also a lot of pure natural gas vehicles being sold in foreign countries.
I can tell you that our customers, the automotive manufacturers, are looking at natural gas and how we get this out there. They're all working on bi-fuel vehicles, which are gasoline and natural gas.