Thread: Gas mileage?
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      01-05-2013, 12:01 PM   #18
jkoral
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Drives: '09 135i MSport 6MT
Join Date: Oct 2007
Location: MA

Posts: 823
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I also average ~20 in my 135i in mixed city/highway driving (lots of full throttle acceleration). I certainly didn't buy this car for the mileage.

I took it on a rare trip the other weekend and for the first time tried to see how high of mileage I could attain. 340 miles each way, I made it on a single tank both ways, averaging in mid 26.x mpg and ~74mph (no stops except tolls). It was light traffic at night, so I didn't mind going a little slower. The hardest part was pulling away slowly from the toll barriers. IIRC, the peak boost for the trip was 1-2 psi.

I assume if I drove 65mph the whole way, I would have been into the solid 27s mpg, but it's really tough to drive that slow for long periods.
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