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In Reply to: Re: Gas quality on the E32 posted by Britt 91 735i on May 13, 2001 at 16:22:20:
Ron
You are getting nothing for any money you spend beyond regular. It does not increase power or mileage. Too low an octane hurts -- too high does not help and, in fact, can actually hurt.
I think that 15 mpg is on the low end of normal for a 735. I get around 17 when commuting in Houston rush hour traffic (about 20% free-moving freeway, 80% stop and go).