This answers a question I was about to post. I have swapped from a 1.9 TDI 4cyl to a 1.0 Petrol 3 cyl and wondered about DFCO not working in some scenarios - instead of 9999 on the SG2 I can still get 150-300 MPG ratings on the overrun. The TDI would go to 9999 at any engine speed over idle.
However from reading this I think I may be driving the petrol too much like my old TDI at low revs, and expecting it to be the same. And there also seem to be min and max DFCO rpms to consider.
This is more complex than I thought
