Quote:
Originally Posted by 0w40X1
Definitely 91 NON which very hard to find in the US.
Car doesn't need 93, and the ethanol dilution of 93 will give you worse gas mileage and maybe power.
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Worse mileage, yes. Less power? Where are you getting that from?
The car will adjust the fuel trims for the enthanol, and will inherently run more timing and possibly more boost enabled by the higher octane. The octane is the critical number regarding power (and overall knock prevention in general), the ethanol content is irrelevant so long as you're not maxing out the stock fuel system.
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'02 S54 M3 (500/500 GC/Koni)
'08 N54 135 (JB4, DCI, BMW PS/Bilstein B6s, H&R M3 FSB, Strongflex FCABs)
'14 N55 X1 (JB4, BMS DP, BMS Intake, Alpina TCU reflash, H&R Sports, Bilstein B6s, E93 M3 RSB, Strongflex FCABs, baby seat)
'08 N54 535xi touring (Bilstein B6s, Downpipes, MHD tune, baby seat)