I currently have a 40amp 240v circuit in my garage that I've used for both a Fusion PHEV and a Sonata PHEV. I understand the Tesla won't be able to utilize the NEMA 6-20 configuration that I currently have. So what are my options? Can this outlet be converted to the Tesla-recommended NEMA 14-50 configuration? Tesla has a plug adapter, but that brings me down to an absurdly slow charge of 5mph.