What Is Top Tier Gasoline?

Top Tier is a fuel-detergent performance standard supported by participating automakers. It is separate from octane grade. A station can sell multiple octane grades that meet the same detergent standard.

Detergent is the focus

Gasoline contains detergent additives intended to help control deposits in parts of the fuel system and engine. Top Tier sets requirements above the federal minimum for participating fuels.

Octane is a different property

An 87-octane fuel and a 93-octane fuel can both meet a detergent standard. Choose octane based on the vehicle requirement.

Brand and station participation matter

Top Tier status applies to licensed fuel retailers that meet the program requirements. The label is not a statement that every fuel additive product is unnecessary.

Use the term correctly

When comparing fuel, separate octane requirement, ethanol content, detergent standard, price, and any special vehicle requirement.

Quick checklist

Use the product label, manufacturer directions, and the specific requirements of your situation. Compare the complete product or system rather than making a decision from one marketing phrase, ingredient, or number.