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      10-11-2012, 05:48 AM   #3
Bmwbreed
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Drives: 2013 BMW 135i
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You are getting better mileage because the engine has retarded the timing to compensate for the lower octane. If u really want good gas try sometime mixing a gallon of e85 with regular 87 octane. I used to do this n my turbo a4 and the difference in performance from 91 or 93 was amazing. You have to be careful though because too much e85 will 1 harm your fuel components or 2 make the octane to high and the car will go in limp mode. Basically I would run my tank below a quarter left. Throw n 1 gallon on e85 and then fill up the rest with 87. E85s octane is an average of 106 so when mixed with regular it makes it about 96 or 97 which is like what they have in Europe and Japan and partly why their cars perform better.
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