[9krpmrx8]

Shell is all I have ever used, they have shell rewards as well so I typically get 0.05 cents to 0.10 cents off every gallon. What fuel you use is important but the station you use matters more. My buddy used to sell gas/oil out in west Texas and he said a lot older stations are not well maintained, have older filtration systems and tank leakage, etc. New stations are held to a much higher standard.