We got plenty of natural gas, and yeah, even corn, and we certainly have the tech to drop conversion kits into just about any internal combustion engine in the US of A. Not to mention, think of the industry! Overnight we'd create tens of thousands of jobs in a nascent NG conversion industry. Truly, we could turn the economy around in a decade; simultaneously reducing our crack-addict dependence on Middle East oil while creating some fresh Not-Made-In-China industry jobs.
Not to sound too Michael Moorish, but I do think the oil industry is more interested in maintaining friendly ties with our tormentors than they are in us. I say we stiff 'em and develop our own alternatives.
The Greenies do not want clean energy, the Greenies want NO energy when it comes down to it.