Also I wouldn't use this product regularly. Maybe once a month or something like that. The main ingredient in Torco and other octane boosters is MMT or Methylcyclopentadienyl manganese tricarbonyl.
This substance is know to really foul up your plugs, O2 sensors, and cats and who knows what else.
http://www.classictruckshop.com/club...park/plugs.htm
http://www.meca.org/galleries/defaul.../Schindler.pdf