There's something you're not understanding, or you don't want to understand. Do the same with another EV and you'll get similar results. All EVs are inherently very efficient in transferring energy into movement, in the 80% range easily. All ICE cars are at most 30% efficient, burning 70% of the fuel without producing work. If you go faster in an ICE, you're only augmenting that 30% that serves to do real work. Double it and you only add say 15% to the total. IF you double the 80% that does work in an EV, you're adding 40% to the total.
Said another way, the biggest thing your car works against to move is rolling resistance and that goes to the square of your speed, something like that. Going faster is absolutely disastrous real quick. Again, it's bad in all cars but you will see a bigger difference in EVs. ALL EVs.