Improves quality of gas. Made with jet fuel (carries active ingredients). Use regularly when you fill up. Treats up to 14 gallons. Improves quality of gas by adding powerful cleaning agents to fight accumulation of harmful carbon, gum and varnish deposits in the fuel system that can reduce performance. Also engineered to remove water, which can lead to fuel line freeze. This product is made with Jet Fuel, a high quality carrier of active ingredients. This product is safe for all gasoline engines. STP Gas Treatment Used Regularly Helps: Boost cleaning performance of gas; Save gas by keeping fuel intake system clean; Fight fuel line freeze by removing water. Made in USA.