I've had my M3 for a week now and have completed a return journey from Cardiff to Manchester (approx. 350miles). I have only used Superchargers, and letting the car do it's pre-conditioning with the Supercharger in the navigation journey. So far, I have not seen any charging speed above 52kW even when no other cars where charging, and I chose the first stall in a pair. Each of the sites was rated to a max of 150kw. Just wondering is this normal?