DEF level

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MMason

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Dumb question. Which reading in def level is most accurate. The trucks gauge or OBD fusion? I’m assuming both should be close as they are both read from the same source def gauge on the truck is full. App is saying 72 percent full.

My apologies for the dumb question.
 
MMason said:
Dumb question. Which reading in def level is most accurate. The trucks gauge or OBD fusion? I’m assuming both should be close as they are both read from the same source def gauge on the truck is full. App is saying 72 percent full.

My apologies for the dumb question.
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Welcome.

The dic gauge is known to be "close", not highly accurate.
 
I've had multiple occasions where it will tell me 999 miles remaining, I'll drive 20-30 miles and when I restart, I'm down to 500. It's for sure not very accurate, especially when it starts getting down the the final ~ 1 gallon or so.
 
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