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It will depend how much is injected at each injection in both modes and the rpm at both modes.
If the same amount is injected in both modes then the one with lower rpm will consume less.
IMHO when in engine break under DFCO's min RPM then the injection is certainly bigger to avoid the engine to stall.
I tried once to see consumption in neutral and in gear at low rpm. In 1st, 2nd & 3rd gear (not tested over) idle uses less gas. IIRC being in gear at lowest speed the car could roll without touching to any pedal, 1st was using 20L/100 (12mpg) and 2nd 10L/100 (24mpg); while idle at same speeds was using much less.
Have fun,
Denis.
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