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OK- just to let everyone know I did try searching first with no results.
Somehow I have forgotten what a 14.7 (roughly) O2 mv sensor reading is. Now I completely understand that a narrow band is not accurate for relating to A/F ratio's, even more so when devaiting from 14.7. I remember that 8-850 is "probably" rich enough under WOT, but am I right that 4-500mv is stoich?