Rich:
From the USFRA 150 Club rules: "Only gasoline, propane, or natural gas fuels may be used - no nitrous, alcohol nor nitro fuel vehicles will be allowed."
From the 130 Club rules: "Only gasoline, diesel, ethanol, bio-diesel, electric, propane, or natural gas fuels may be used - NO Nitrous Oxide, Methanol, or Nitro-fueled vehicles will be allowed."
So much for putting a bottle on the car and running without all of the safety equipment, hey?