With the fuel mutliplier at 1, I tested the Porsche VGT Spyder, since it has a range indicator on the dashboard.
Tearing around the Tokyo East at full pelt, the range is about 78km, which is fair enough given the 600kW it's putting down.
If you cruise around at 100km/h, you'll find the real-world sensible driving range is around 280km, which seems reasonable for an electric hypercar, though I'd think Porsche would want to aim higher than that. I'll have to test the Taycan some time to compare.
It's easier to measure range with ICE cars, where the MFD tells you how many laps you have in the tank. I tried the Mazda6/Atenza diesel at 1x fuel at the same track, I forget how many laps it said could do at full speed, 40 to 60ish, but cruising it could easily do 110+ laps of Tokyo East, for a realistic 800+km range, maybe up to 1000.