On my '90 Jetta( Digifant Injection), the DFCO seems to be more dependant on the speed of the deceleration than actual RPM or vehicle speed. MPGuino has shown that even in a cold engine, DFCO can kick in when shifting and at low revs if going down a steep enough hill.
Drewb- a manual cut off switch would let you FCO for as long as you want(love mine).
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