ignoring efficiency talk, going back to wear and tear, take a gander at FedEx and UPS. How often do those trucks turn off and on in a given day? I watched a driver shut down, deliver, fire up, drive 50ft, shut down, deliver, fire up and drive away. Could he have walked that 50ft faster? who knows, but start-stops are very common on those rigs. I think you'd be alright with cutting the motor on glides, but if you're hauling 3.6T, I'd be VERY hesitant to cut the thing that will help stop me. I'd settle for idling.
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