[Phantom]

Sorry I have not been around as much. The easiest way for me to tell when it is in DFCO is the car switches to open loop mode. On the Grand Prix Open Loop is only used when 1. start up, 2. High throttle, 3. DFCO, 4. When MAF is dead.

Without a scanner its hard to tell what it is doing as you cant feel if in DFCO.

As for being in gear or Neutral here is how I do it.
In Gear if:
Speed is under 27mph.
If it can't stay in N for atleast 10sec (Fuel use increases for a sec or two on the shift in/out of N.)
If I will be stopping or accelerating soon.

N is used in all other situations but mostly down hills or long shallow slopes that I can maintain speeds on. A tip for that trans is let off the gas for a sec before going to N and when shifting back to Drive lightly press the gas if your speed is >63mph that way the TCC does not need to compensate for the needed increase in RPM (rev match the shift).