Probably whatever motor is Bosch selling to the highest bidder.

You don’t really hear much about Bosch because it’s not on the stock market. But they have a couple of huge research centers worldwide and their tech is used by every auto manufacturer in the industry.

Probably Lucid. They claim 15% better whole-car efficiency than the next best:

https://www.youtube.com/watch?v=JwzOlPBheO0

The Lucid Air Dream Edition does a 9.9 second quarter mile:

https://www.youtube.com/watch?v=7LRT7bIJcis

And the Lucid Air Grand Touring is supposed to get 517 miles EPA rated range:

https://www.motortrend.com/news/2021-lucid-air-technology/

https://www.lucidmotors.com/

Electric motors are already incredibly efficient, so even halving their losses / doubling the efficiency would increase range by at most a few percent.