Prof/Tom comment:

I think Jordan's recommendations should be followed.  In particular, you might look at how much natural gas is coming to be available soon due to shale gas and horizontal drilling and fracking technology.  It is a huge amount and raises, it seems, the possibility of quickly and rather easily making US cars converted to flex-fuel vehicles with natural gas along with  gasoline.

NOTE:  This research blog is seriously lagging behind in the work done here over the past month since it was established. Gotta get going!!  - Tom O'D.