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Engine Control Module Reprogramming 9102934
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Post Engine Control Module Reprogramming 9102934 
I recently had my 2017 Duramax Chevy 2500 in for regular service, and the dealer updated based on the recall: 18863 9102934 Engine Control Module and Transmission Control Module Reprogramming with SPS. Since this update, my fuel mileage has dropped considerably. I have a regular road trip of about 600 miles and was getting 22-23 MPG driving at 78-80. Since the update, I now get 18-19 on the same trip. I went back to the dealer and they claimed it may have been due to low Def. After 3 similar road trips and about 4K miles and a full Def tank, still experiencing lower mileage. No other changes to the truck and about 22k miles total.

Has anyone else experienced this same problem?

Thanks, Steve

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