We purchased our model s used and have been surprised by how low the range has been since we purchased it. We average close to 400kw and we are not in an extremely cold climate. We keep being told there is no issue with the battery and that it is the heating and speed that is an issue. I expect to loose some range for that but everyone we have talked to that have Teslas say they average 250kw to 300kw. Any thoughts on what could be causing the issue?