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I was getting around 23 mpg (mostly highway). Then recently, I took a trip, No eco mode, ASS off, and I got an average of 29mpg. I've got about 4k on the odometer.
Someone told me that BMW's run rich to help break-in, then lean out. So the difference is more dramatic after break-in. I don't know if that is true or not. But I'm getting much better gas mileage now.
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