Answer (1 of 4): According to Car Magazine UK in their Tesla Model S P90D (2015) review you can drive in Ludicrous mode with the highest acceleration and a max velocity of 155mph for 120 miles, or approximately 46 minutes. However, this number refers to actively using the Ludicrous mode, presuma...
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Christian Bull
, Model S owner February 2014-17, Model X since May 2017
Answered January 28, 2016 · Author has 866 answers and 4.3M answer views
As others have touched upon, the Model S top speed is not limited by available power, but by available RPMs.
When cruising, even at top speed, a P90D only utilizes the 259hp front motor, which is geared to rev lower than the rear motor. There's absolutely no need for even that much horsepower to cruise at top speed - remember that for top speed weight doesn't matter, it's a question of drag versus horsepower, and the Model S has the lowest drag on the road. Hence you're not using anywhere near maximum power. The power limiter on my S60 allows less than 120kW of power at its top speed of 193 km/h (120mp/h), and the actual consumption is lower (sorry, I was too busy paying attention to the road to make detailed notes).
A 90kWh battery pack is nowhere near 90kWh in available power, however. It's closer to 80kWh. (85kWh packs are 76kWh usable).
People who have averaged 160 km/h on the Autobahn, report a consumption of about 300 Wh/km, or 260 km effective range in an 85. At 180 that goes up to 380 Wh/km for a range of 200km (speaking of 85s, not 90s here btw).
As the laws of physics dictate, consumption increases a lot as speed goes up just a little, so cruising at the full speed of the P90D is probably going to set you back at least 5-600Wh/km. Let's assume 600Wh/km and 80kWh usable. That'll give you a range of 133km