Environmental policy?

Why does everybody think gasoline is the only fuel out there? Run the trucks on natural gas (methane), as my Crown Vic and F-150 pickup do. It's a whole lot cheaper and cleaner, and California even has natural gas filling stations available already. Plus, there's gobs of natural gas in this country, so we wouldn't have to line foreigner's pockets with cash every time we fill up. I've had my car and truck 2 years and I love not buying gasoline! Natural gas is only 93 CENTS per gallon where I live, by the way, plus I got a big tax credit for buying them in the first place. What's not to love? That's my 2 cents.