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I can tell you that my 97 Suburban & my 2009 Pontiac G8 do not utilize DFCO very well, if at all.
The Suburban has been verified by my scanguage, (which also will erase the radio memory overnight).
According to the Wife's hot rod's Driver Information Center (DIC) I can only get to about 100 mpg engine breaking in gear (DFCO). I haven't tried the scanguage in it yet.
I don't know if it is because the suburban in older & the Pontiac is Australian or what, but I wouldn't say all GM products use DFCO.
Don
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