When I was getting my license, coasting in neutral was legal for cars but illegal for trucks. Made it sound like a safety issue. So I guess you poke the brake once in a while to make sure it's working?
The added drag is only engine side the transmission, right? The other side is moving with the differential.
I guess my question is, on a hill too steep to coast down is it better to use compression braking, or disengage the engine (however) and retard it with the service brake?
My vote is for air brakes, like the perforated dive brakes on an F-86.
