They will take an almost unlimited diet of unleaded gasoline and you might get a pint or so for nothing by hanging around a filling station and intercepting someone who is filling his car. Or by just draining the remaining liquid in the hoses that have been hung back on the pumps.
They will also burn Kerosine which is a safer fuel than white gas. Odorless kerosine is available in 1 qt bottles at nearly any hardware, home store or Wal-Mart, etc. since it is used in decorative lamps.
This message was edited by DaveB on 4-17-08 @ 6:24 PM