I will have to do some more monitoring on it, but the way your describing lean burn it seems to act that way. Apparently MMO is really a mystery. Hopefully someone can chime in. I noticed it twice and passed it off as an anomaly during my 59 mpg tank. Now with some throttle feathering I was replicating it so kind of baffling. Will play with it as I run this tank and will continue to add the MMO.
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