is the DFCO controlled independently of the EEPROM (chip) data? or is it programed into the fuel maps. where the computer accomplishes DFCO by having really lean duty cycles/pulse widths for the injectors in the really high area of the fuel maps where the engine would be when your coasting or let off the throttle really quick at a higher rpm where the vacuum would shoot way up?
how would the ecu even know. My guess is that it would go by vacuum. if not that what else?
I ask and am really curious about this now because at slightly above a half of a tank I started leaving the car in gear instead immediately putting it in neutral on hills and where ever I get a little momentum. and I'm on my way to my best tank ever. finally hitting 40mpg.