Quote:
Originally Posted by EL BAN
I think the general consensus on this thread is YES, a 91 vs 93 run could potentially show better numbers for the 93 running car given that stock tuning from BMW might have been tailored around having 93 available at the pumps.
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Yeah, that makes sense. Real question, is it worth mixing 100 octane to get to 93 octane in California, if it's only your weekend car? It'd probably take about 3 gallons of 100 octane to make the mix = 93
~$60 per tank assuming 100 octane is ~$9-10/gallon