https://www.wired.com/story/self-driving-cars-power-consumpt...
I think the intro kind of overstates the downside. Lots of people will be happy to pay for more fuel if it means they don't have to drive.
I think it will halve as the tech progresses, just due to optimization. Also, no windshield means better aerodynamic possibilities that could compensate for the loss.
https://www.wired.com/story/self-driving-cars-power-consumpt...