Newly reformulated, AMSOIL P.i. is the most potent gasoline additive available today. As a concentrated detergent, it is unsurpassed in cleaning combustion chamber deposits, intake valve deposits and port fuel injector deposits. AMSOIL P.i. helps maintain peak engine efficiency, fuel economy, power and drivability. AMSOIL P.i. maximizes fuel efficiency by dissolving and removing fuel system deposits and other contaminants for improved power and overall performance. AMSOIL P.i. also works as an “emissions passer.” It is ideal for use prior to emissions inspections. Treat gas, run that tank and fill up again prior to test. Safe for use with catalytic converters, oxygen sensors, oxygenated gas and 10% ethanol blended gas. Tests results show improved fuel efficiency between 2.3% and 5.7%. One bottle treats 20 gallons of gas. Treat one full tank of gas every 4,000 miles or 100 hours of service to protect peak efficiency. Improves fuel mileage an average of 2.3% and up to 5.7%