All gasoline sold in the U.S. meets minimum requirements set by the government. The differences between brands come in the additives and detergents added to the blend to help extend the life of the engine.
Some fuel companies — working with major automakers that include BMW, Fiat-Chrysler, General Motors, Honda, Mercedes-Benz, Toyota, Volkswagen/Audi — have taken it a step further, setting a higher standard that has become known as Top Tier fuels. Brands that qualify as Top Tier contain additional detergents beyond the minimum requirements, and help prevent carbon buildup in car engines.
According to one AAA survey, Top Tier fuels left 19 times fewer deposits after simulating driving 4,000 miles in an engine lab. Top Tier fuels also helped clean existing deposits from engines. To find Top Tier fuel, look for a Top Tier logo on the pump.
Read the article at Autoblog.
