BLV

Yes, it’s got about 10K on it. Bought it new. Be nice if they told people that’s normal. I had it back to the dealership for this, but they couldn’t find anything wrong . Thank you for replying.

I have a 2020 6.6 Duramax diesel HD. At random times, the fuel mileage will drop ( on the display) by about 8 miles per gallon. That lasts for about 20 miles or so , and then the fuel economy goes back to normal. When I get out of the truck I smell a hot plastic burning smell ( only when the fuel economy is not normal ). Is the engine in the regen cycle?