I got my M3 in June. I charge it at home to keep it at 80%. Initial two months, 80% charge would translate to 400 KMs. But last month, it reduced to 397. Now it charges to 80% but it translates to only 376 KMs. I know that battery discharge depends on many factor including drive style, environment, AC etc. But the actual charging should not change so much in just few months. Anyone else has the same situation?