I have been using it for 6yrs and will not use anything else. I use it in 2 trucks, 3 cars , and the 3 outboard motors on my 2 boats. I know about 80 people that use it in their boat engines and will not use anything else. It stabilized the gas in a friend of mines boat for 3yrs. He filled it with gas and added Pri-G in Oct 05. Boat was not started again until Nov 08. Fired right up and he burned out the 120 gals fishing. I know this because he is my neighbor, and I started him using it. Try it and you will never use anything else! I also use it in my lawnmower and weedwhacker. For you boaters, it is the only additive that Sea Tow endorses and uses in their engines.