I don't have my pile of Challenge Magazines handy, but there is a mini adventure for T2K called "Pennsylvania Crude" in one of them that may cover this.
Those of you who have not seen it should try to catch a program called "Backyard Oil" in the Discovery Channel...this would probably be very common post TDM
http://dsc.discovery.com/tv-shows/backyard-oil
Remember, small crude refineries popped up starting in the late 1800's in the US...they may be crude, but some gas and diesel is better than none.
-Dave