TOP TIER™ Performance Standards

Gasoline Performance Standard

The TOP TIER™ Detergent Gasoline Deposit Control Performance Standard describes the test methods used and the performance requirements that retail unleaded gasoline must meet to be licensed as TOP TIER™.

Diesel Performance Standard

The TOP TIER™ Diesel Fuel Performance Standard was developed to improve performance, in turn helping the diesel fuel retailers, auto and engine manufacturers, and particularly those who drive or use diesel-powered equipment.

A Higher Fuel Standard

Is TOP TIER™ Better?

What is TOP TIER™ gasoline?