dinoto

So I have just over 6k on mine and have had a problem with excess regens since new. I started logging the mileage at approx 2k miles. I get between 150 and 300 miles between regens and my mpg averages 25. My driving is basically all hwy (90/10). I have the 2wd, which is rated 23 city/33 hwy. I just came from the Colorado Duramax and I averaged 28 mpg over 92k miles. That Duramax was rated at 31 hwy. Since my driving style hasn't changed, I figure I should be averaging 30 mpg instead of 25. I took it to the dealer last week and they kept it for a few days only to call me back and say that they couldn't find anything wrong - SHOCKER!!! I monitor everything, including regens on a live OBDII program, so I can see regens start and complete. The truck wasn't throwing a code (which I told them they wouldn't find) and all they could figure was that I shut off the truck before completing the regen. The service writer to his credit told me he knows that sounds ridiculous because he knows I drive all highway miles. I had told them to contact the engineering team at GM since this is a new engine, but they didn't. They just performed a forced regen and told me to see if anything changes. I told them that some have had exhaust control valve problems and to please look into that. No word on whether they did that or not because the tech was out sick and didn't complete his notes in the system (this dealer's service dept has gone to crap). Anyway, just wanted to throw this out there to see if there are any similarities and for anyone's input. The mpg thing really chaps me. I was expecting 30 like everyone else. No luck.