I am Teh Edumacator.
Join Date: May 2005
Location: ATL, London, and Barcelona
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It's never ended up a wash to use higher grade fuels in my bimmers.
My M3 gets 34 mpg on the highway with high octane. It gets about 29-30 with regular gas. That's more than a 10% difference in performance with less than 10% difference in price.
My 528 was capable of getting up to 37mpg on the highway with premium. I never got higher than 31 mpg with lower grade gas.
I haven't tried putting lower grade fuel in the 540 yet, and I don't think I will.
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1999 E39 540i/6-VF Stage 1 S/C, Dinan exhaust, Dinan strut+shock braces, Dinan ltwt flywheel + clutch, Dinan Brembo BBK, Dinan monoball, H&R Springs, Koni Yellows, M5 sways, Dinan forged 18" wheels, &c.
1995 E38 740i. Highly modded. Faster than you.
Sold 2-28-07: 1997 E36 M3/4, 8-30-05 RIP 1997 528i
Lindsay fan club member.