gas is pretty much gas," Tim Lieuwen of Georgia Tech’s College of Engineering said. Many stations sell what’s known as “top tier” gasoline. It has additives that exceed what the ...

Learn why at least nine major automakers recommend using Top Tier gasoline to prevent costly repairs and maintain optimal engine performance over time.

Several Georgia gas stations have sold customers contaminated ... To be considered Top Tier, the gasoline must have a higher concentration of detergent added to it. AAA said it was surprised ...