In the map options, the range circles only go up to 350 miles, but now the Model S does 402 miles (647 kilometres)(formerly 370, 373, 391), so the range circles do not show the maximum possible range. The range circles on the map need to be updated to 405 miles/650 kilometres.
Looks like it’s a simple change in this file: https://github.com/kdwink/supercharge.info/blob/master/src/main/primary_entry/script/page/map/RangeModel.js#L20