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at 28,000 miles, got a message to service DEF system. Dealer found shorted DEF tank heater. Replaced it. Replaced reservoir. Prior to this, I always got a few mpg drop during regen. After this, I lost about 3 mpg and am never aware of the regen. Back to dealer at 36,000, they state no error codes and everything is fine. Anything I can ask them to check to help get the mileage back where it was. Truck is stone stock. Help Please.

2015 2500HD
 

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I would ask the Dealer if they did any program updates during the repair(s).
If they did I would suspect the ECM upgrade to be the culprit.
With all of the Emissions requirements going on the dealer may have changed the emission parameters.
 
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