That's why I asked.
There are no legal implications either. I talked about the insurance side. What I'm trying to get at here is, if it's a portable unit, you get rid of the issue we talked about in terms of filling stations, because every home or whatever number of homes are filling stations. I'm sure there are going to be some volume benefits as this becomes more profitable.
In London we have a very large taxi group, Aboutown Transportation, that runs on propane—all their taxis run on propane. Why natural gas versus propane? I'm not asking you to compete against the industry, because I think one of you said “right fuel, right price, right time”. That was you, Mr. Egan.
Why natural gas versus propane?