I tend to stick with Shell or BP. I switch from time to time, mostly using Shell, but going through a full tank of BP from time to time. Always 93 octane up to 10% ethanol. Not much you can do about the ethanol, not that it matters much anyway. Shell V-Power ftw!
'11 BMW E92 ///M3 - ZCP and DCT
'15 Ford F-250 - Lariat, 6.7 Powerstroke Turbo-diesel