Should you care how much detergent is in the gasoline you buy? How can you even tell?
Leading automakers BMW, General Motors, Honda, Toyota and Volkswagen think you should care, and they want to help you find stations that sell the cleanest gas. They want some fuels certified as best for fuel economy and emissions. Not everybody’s on board, though.
The automakers formed a consortium, Top Tier Gasoline, that certifies retailers as meeting their standard for detergent. Detergents prevent deposits of leftover material from building up in engines and exhaust systems. The deposits, like the crust of minerals left when hard water evaporates,can reduce fuel economy and performance.
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