Energy is an interesting comparison. Perhaps we should look at $/energy unit, and compare those dollars to the full cost of hiring a human including time off and benefits and payroll taxes and everything. We should also consider that the human consumes a lot of energy that the AI does not: many truckers have PC's, TVs, consoles, etc in their truck and burn fuel to play video games during their off hours.

I don't think we're going to replace truck drivers any time soon, but I'd be surprised if in say 30 years the vast majority of trucking wasn't automated.