North America is sitting on a huge Nat. gas bubble, nat gas is at all time low price, less than $2.00/ gal equivilant, ..and is the way of the future, imho.
You guys with big Ford trucks should check out the nat gas conversions avail.. they take an afternoon to install..
If someone can make an engine run on nat. gas, the ways Audi got the diesels to run(and banned for too much power, I believe).. that'd be a gass... lol.
A lot of the new big trucks being built, are for nat gas,, and a dude named Boone Pickens is putting Nat gas at all Pilot/Flying J. fueling stops..
Links to Conversion and nat gas info..
http://www.cleanenergyfuels.com/
http://www.westport.com/