I suspect modern diesel electric drivetrains are probably in the low 90's, especially with a lithium battery in the middle acting as a buffer so there's never a

I suspect modern diesel electric drivetrains are probably in the low 90's, especially with a lithium battery in the middle acting as a buffer so there's never any over-production by the generators. Even if trucks do spend the majority of their time on the highway, it's not all of the time and the efficiency gains every time they need to stop and start are significant.