Today you must use a gasoline additive. Because there is so much water in today's gas. Also, the ethanol is really bad too. Star-Tron is the only one that I use. Why you ask. Great question. Certainly a question I would asked. Anyways here is how to use Star-Tron the right way: 1. First, grab your 2.5 gallon gasoline can. 2. Go to your local hardware store. Ask for Star-Tron. And it is only less than $10.00. 3. Next fill your gas can with 2 gallons or if you have a 5 gasoline container then pour in 4 gallons. Then, grab your Star-Tron and either pour 2.0 ounces of Start-Tron. 4. Mix it up really well. 5. Now this is the important part. Because you have to wait exactually 1 hour. This is the only way that Star-Tron will work. 6. If you do not mix this right or wait the hour. It will not work.