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Originally Posted by ZeroG
My average MPG now reads high, and yes I reset it when I get gas.
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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.