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The beauty of many of the roads I drive, I suppose, is lots of time to watch the guages.
My DFCO cuts off at ~2000 rpm regardless of time.
Coming down a hill, the water temp will drop to ~192 with engine-on coasting, temps hold ~198 with RPM's in the mid 2000's and no fuel, temps climb to ~206 with RPM's in the mid 3000's during prolonged no fuel engine braking. An 8 mile down grade of consistent 6 or 7% (I-70 tunnel to Silverthorne) will have me cycle between DFCO and engine-on coasting several times. Pulling a trailer I can't really coast out of gear though or I'll melt my brakes.
I'll bet the exhaust gas temps are the reason for cutting off the cut off. Too bad, most of those descents transition into climbs, and temps will jump right back up with hardly any wait at all.
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