[cucumber3732842]

It probably still does fleet wide. Remember, the other driver isn't gonna brake hard without reason because he has an electronic narc in the cab that will tell his boss every time he does. The flipside of this is that the driver in the back isn't gonna imperil their "stats" by tailgating to save fuel because their own electronic narc will report that to their boss.

And even if the company crunches the numbers and finds that tailgating saves a ton of fuel, they can't say "well ackshually guys, you can tailgate if it's another truck" to their drivers because society is full of dishonest jerks and we therefore can't have an adult discussion about just exactly how much diesel exhaust you have to save to make the marginal increase in semi trucks rear ending each other worth it.

Heck, the company probably can't even run that fuel vs braking analysis overtly because Pinto. Isn't progress great.