E46Fanatics - View Single Post - Octane placebo or logical replacement?
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Old 10-26-2012, 01:48 AM   #11
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Join Date: May 2010
Location: Seattle, Washington
Posts: 1,449
My Ride: 2010 335i Msport 6MT
Just run a few tanks of each and compare mileage. You won't kill the car, but cost savings will probably be next to 0.
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