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I think the emissions drop comes from the fact that they are EVs, not that they are autonomous.

I believe you'll find that the difference between a machine and a human driving the same car can be dramatic. A lot of humans just drive like complete dicks. Switching the throttle map on my car to "eco" and driving in a sensible way gets me +50% MPG compared to setting the throttle map to "sport" and driving like a teenager.

> EVs