"Flooring the pedal overrides the eco mode so why would that be more economical than driving more conservatively?" I don't think it would be and certainly never said that. I did that to see if the range estimate could be convinced Comfort was a better mode than ECO PRO+ and it can. But why?
To be fair, drive the same route as close to the same speeds as possible. I did/do repeatedly and mentioned that above. It seems to make no difference.
"Using EcoPro learned habits, I now do 15.5 on average at Comfort mode." This is sort of my point. The car is changing your programming, not the car's. And if your habits were good before, the change would be zero. It's a feel good button. I had a '75 Diesel Rabbit in college and used to drive 250 miles to see my girlfriend at her college. I drove slow and didn't use the A/C, coasted to a stop at red lights and stop signs. I just did not have extra $ for extra fuel.