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.
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2011 335i, FBO, N55+ Turbo, full E85, S55 intercooler, etc.
2015 X5 35i Xdrive
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