Note that unlike gascars where driving them faster almost always gets you to your final destination faster, for EVs, somewhat counterintuitively, there's a
practical speed limit defined by the average charging speed of the Supercharger you will recharge at: if you drive faster than this speed then you'll increase the total time spent driving and recharging.
For example if your next Supercharger session is going to charge you from 60% SoC to 90% with an average charging speed of 45 kWh (starting at 60 kW then gradually tapering down to 30 kW), and if we consider the Model S constant speed power consumption graph:
Then driving faster than ~160 km/h will probably
increase total travel time. If we also consider the more dynamic acceleration+braking cycles that high speed driving on the Autobahn requires, then with such a charging session there's probably diminishing returns at speeds over 140 km/h. (!)
If you allow the SoC drop much lower, and increase the recharging speed accordingly, then high speed driving makes more sense - but I suspect it requires 150-200 kW charging for 200 km/h peak velocities to reduce the true total travel time measurably.
The travel time optimization gets more complex if you have a fixed time quota until the next biologically forced charging stop
- but even then it probably doesn't make sense to go beyond 200 km/h on the Autobahn, as power consumption increases sharply due to drag increasing quadratically with speed.
