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In have a 2016 and never had an issue.
It says def ok until 40%. I think it starts giving you mileage alerts less than 30
I usually add a 5 gallon jug once per oil change (~7K miles).
Only once did I top it off and it was stuck at 40...it cleared up after a few days of driving...sensors are probably like the ones in your black tank...if you get build up on them it take a while to get it off.
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