Top Tier gasoline contains more effective detergents than federally required, which helps clean fuel injectors and reduce harmful carbon deposits inside the engine. Clogged fuel injectors and ...

At least one kind of fuel cuts through the marketing malarkey. Top Tier gasoline is engineered to a higher standard. And it’s ...

AutoGuide’s regular “Under the Hood” segment has already explained the vagaries of octane and the advantages of Top Tier gasoline, but there’s so much more to fuel than that. Ethanol ...

Consumer Reports says to buy good-quality gas and recommends using Top Tier gas. Top Tier is a higher standard that brands, ...

As per the Top Tier Gas rule that "fuel marketers use the same minimum detergency treat rate for all octane grades of gasoline sold at their stations," all Shell gasoline – regular, mid-grade ...

Currently, gasoline and new cars meet Tier 2 standards that were implemented from 2000 to 2007 and resulted in a nearly 10-fold reduction in sulfur and cut tailpipe emissions of nitrogen oxides by ...