I use 91 consistently. Higher octane is very rare around here. I always use Shell V-Power as it is the only gasoline available that does not contain ethanol.

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Current BMW
2011 BMW 528i
Cashmere Silver/Black Dakota
Ash wood trim
Sport Package
Premium Package
Nav
Premium Sound/Sirius
Comfort Seats



Prior BMWs
2001 530i Sport (deceased)
Cosmos Black

Other
2005 Subaru Outback 2.5XT
1977 Corvette 383 Stroker