Hi, I recently bought an ex demonstrator I3 with range extender. It had 8000 miles and was manufactured November 2013. When fully charged the indicated range is usually very close to 80 miles give or take 2 miles. I get 4.3 miles per Kilowatt hour on my daily journey to work which mostly involves dual carriageway driving at 55mph. The problem is that it seems to use more miles of range than the distance I actually drove. When the battery indicator is at two and a half bars it only says 40 miles usually. I am just wondering if this is normal?