It's almost 7 months to the day my Roadster was delivered, and for the first 4 or 5 months ideal range after a standard charge was consistent in the 192-194 mile range. However, over the past 2 months or so, it's been dropping off a bit pretty much every time I charge, down to 179 miles now after a standard charge last night. Over time of course battery capicity will decline, but it seems a bit rapid. Has anyone else seen such a drop? Should I take the car in to have it looked at?