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 ...

TOP TIER™ gas is gasoline (and also diesel fuel when applicable) that has been certified to meet specific performance standards. A group of automakers -- Volkswagen, Toyota, Honda, General ...

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