excessive DEF useage

RichardJ

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I have a 2020 silverado 1500 with an L6 diesel. I recently used 5.8 gal def on 1006 miles trip (10 - 12 mpg). The previous 1400 miles used .5 gal 25 mpg
 

zora

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Since it is a brand new truck, is there a reason you dont take it back to the dealer for service?
 

RichardJ

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Since it is a brand new truck, is there a reason you dont take it back to the dealer for service?
I did they said it is working fine because the diagnostics showed no errors. Just wanted to see if others are having same problem
 
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