This is pretty interesting. I've noticed that in my Yaris it only goes into DFCO (also 9999mpg on my ScanGaugeII) during actual engine braking in gear, and I can feel the engine braking. I've never seen DFCO outside of engine braking. I will say that I have seen DFCO come on for a split second when I shift to Neutral, but I think that has to do with a very brief moment of engine braking before the coast.
Looking forward to your results with these tests.
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