Hopefully I am not asking a stupid question ... So, what is Ludicrous or insane mode? I know they are faster, but since Tesla doesn't have gears, it is not like an ICE car in 'Sport mode' that would hold on to lower gear to keep up the RPM for torque, what exactly is insane or ludicrous mode? Does it waste more energy compare to 'Econo mode'/regular mode if it is left on all the time? Or, does it work the other way that the non-Insane mode actually slowering down the car to keep the acceleration smoother and 'less nauseated'?