Hi and welcome to the forum.
1. Do you have auto-hold on? That can grip a little whilst trying to pull away gently.
2. Maybe the rear controls are set to something very different to the front and the fan is trying to meet the demand.
3. I'm averaging 37 MPG imperial and very happy with it indeed.
4. Can't comment
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Fastbuck
2012 F01 740d M Sport Alpine White Oyster/ Oyster
2013 E84 X1 1.8d M Sport Alpine White Black/ Black
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