I don't know about the 400 mile range because it's not a concern. Your other question seems to be a trick question. But my 640 GC can actually cruise quite well. If anything I have to set an alarm at 80 mph so I don't accidentally take it to 90 without knowing it. I hope that answers your question. Your profile says your going to drive an M6 F12 soon. So why the question between a 640 and 650?
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