Why regen so much?

I stopped at a few dealers this week and no one could fit it in, I talked to my dealer and they said to bring it right in when I get home, few hours to go and I'm off for 4 days so they will set it up, he said they need to idle at around 1100-1200 for our weather, all I can do now is 850, it's been warm enough the last few nights that I've been shutting it off and using the bunk heater, trucks working great otherwise, got 7000 km on it now, here she is with the first load.

He's gonna set it up so I can take it anywhere from 900-1400.

 

Got its first wash yesterday, the trailer was more than due, I've noticed a few people this week taking pictures of the truck, lol

 

The truck is working great so far, no issues yet, they programmed the auto elevate onto it and that seems to be working but I shut it off at night now that its summer time, I am having one small issue that started yesterday, when I shut the truck off it continues to run, last night at the truck wash when I turned the key back it just kept on idling, finally died about 30 seconds after, but then today it did it again when I was at the border window crossing into Canada, the guys like shut your truck off and I handed him the keys, lol, dash lights and gauges and everything else turns off but the motor keeps running??!

 

Yeah I took it a few months ago and had that enabled, working good now but the last few weeks when I turn the truck off it keeps idling for about 30 seconds, haven't had that looked at yet.