Paul, once again, thanks for the clarification. I learn something every time I hear from you! It appears that the ECM interpolation alleviates any worries about the table resolution.
My main interest was the baro update, and if this is the way it's universally done, then there's not much point in beating a dead horse.

I have in the back of my mind an evil scheme to have my cake and eat it too. A time delay relay between the signal terminal of 1 bar and 2 bar MAP sensors that would allow the ECM enough time to sample BARO, then switch over to the 2 bar for running. Mwahahaha.

Does the ECM pull BARO as soon as the ignition is powered on, and how short an interval would one need before switching to 2 bar so as to avoid potential starting or idling problems? Or am I just full of s**t? :wink: