No, it's like saying everyone should cut down their JavaScript files by 1kb to reduce emissions.

It's more like saying that if you somehow turned off all the fancy electronics, you'd add maybe half a mile to the car's 200+ mile range.

An entry level model S has a ~360hp engine, so 0.2 MW

A million of those cars is 200,000 MW

Amdahl's law: when optimizing performance, target the largest consumer first. And in this case the engine is the largest, by at least 5 orders of magnitude

It would save much more electricity educating people to drive less aggressively and use less braking than to remove the sensors