[ankit]

Hmm, people seem to think that Sunoco has really good fuel. My dad recently changed the brand of his gas station from Citgo to Sunoco and business has shown to favor Sunoco. Customers also come in and say they buy nothing other than Sunoco because it works best with their vehicle (this is something that nobody ever said about the Citgo fuel).

But as SVO said, it would be pretty hard to test. Way too many variables.