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Originally Posted by Brian-bmw
The problem is imperial gallons versus US gallons. This has happened to a few folks when they did an OS downgrade/upgrade. I had it happen to me a while ago, and I noticed that my OBC was showing gas mileage that was about 4 MPG higher than normal.
Try this... pull the fuses for the Instrument Cluster for about 2 minutes. Afterward, my OBC mileage dropped by 4 MPG to what I was used to seeing. It was an instantaneous drop, as if it immediately recalculated the numbers. The E38 fuses are 18, 23, 26, and 41, all 5A fuses under the hood. I am not sure what the comperable X5 fuses are.
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WOW! That makes even better since than the mileage difference. I pulled the fuses this morning, and drove the car around the city most of the day. It now reads about 20.3 which is more along the lines of the actual mileage..
Thanks for the info....
Edit: OK, confirmed that resolved the issue. I never thought I would be happy to see sub 20 MPG.