anyone know anything about this product? a guy i know just came by and is selling the stuff, very expensive, like 45 bucks a quart, but only 1 ounce per 10 gallons of fuel. Like most salesmen, he made it sound like gods gift. claimed up to 20% increase in mileage, when i told him i run 2 cylce and a little marvel, he said they increase carbon in the atmosphere, meanwhile the local fiberglass plant has been operating over its polution credit limit for like 8 years.