The running on gas for the cool-down has got me a little curious on a couple of points.
Gas gas burns hotter than diesel, and I'd think burning gas would actually help keep it warm. But then maybe that's the point,that you might get a more gradual cool-down with the gas??? I know the Cummins in my Ram has a more complex injection system, but it runs under load with a coolant temp about 190*. If I leave it to idle, it will drop in a fairly short time to about 160*. On that engine, the cooldown is actually more critical to cooling down the turbo to keep the oil it uses as a bearing from coking up on the shaft.
Other thing that comes to mind is that maybe somebody in recommending switching back to gas was thinking of the distillate dual-fuel engines. On those you did want to switch back to gas and leave it run for a few minutes afterwards, to flush all the distillate out of the line and carb so that you'd have a bowlful of gas the next time you start. Saved draining the bowl to get it to start next time.
Mind, I'm not challenging anything, just curious. If the books or experience call for idling to cool it down, by all means that's the way to do it.
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