Bro, any single metric, in isolation, will always favor the mechanical. Think your foot is steady? A machine can do it steadier. Think you pay attention to the road? A machine can pay more attention. Think your reactions are fast? A machine is an order of magnitude faster.
Every single metric, in isolation, a machine compares more favorably.
So why do some humans get better gas mileage than machines in real world long distance driving? Why do some humans have far fewer "close calls"?
It is because humans have something called context. They can see that a hill is coming up and can gain a bit of speed cheaply downhill before going up the hill. They look forward 12 cars ahead and see that the tractor trailer is either slowing down or speeding up. They can see the kid's ball flying into the road, knowing that a kid will be following shortly.
In summary, while machines can ping every metric in isolation better than a human, it can not combine all of those metrics better than a human can. Machine driving is barely able to replace the worst of us. It has a long way to go before it can even compete with the best of us.