My 2018 came up pretty quick too when i first purchased it. I am pretty sure the dealership only put in enough to get the warning off. Once I topped it up it has been "normal" and I guess accurate. Obviously it calculates the def useage based on fuel used as when towing it uses it much faster . Even when its low if you read the message carefully it tells you that if you don't put fluid in you will have like a 600 miles before it goes into limp mode. (Don't quote me on the mileage to limp mode as i'm pulling it from memory and my memory is awful).
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2020 GMC 3500 Denali Dually Duramax 6.6
2013 Fuzion 342 ToyHauler (Ours)
2011 Harley Davidson Streetglide custom (Mine)
2012 Harley Davidson TriGlide (Trike) (Hers)
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