I've logged every penny of gas that has gone into my 6, and my regular brands of gas have been Speedway, Shell, Kwik-Trip, and Mobil.
The results show less than a 2% variance in MPG between these brands. Speedway was the overall winner, and is the only one that is not licensed as Top Tier.
The results show less than a 2% variance in MPG between these brands. Speedway was the overall winner, and is the only one that is not licensed as Top Tier.