At what temperature do you idle no matter what, even if you have an apu

It was minus 28 Celsius in Dryden, ON over a week ago (that's minus 18 fahrenheit). I onky idle for 14 munytes max vecayse im tring to prolong ny DFP Cleaning which they recommend when my truck was at 174k mi's to get ut cleaned in another 50,000 miles. The newer Paccars seem to have issues so I'm trying to heep the engne hours vs. Miles ar 45. 50 is ideal but the border crossings ruined that average.

A good bunk heater, thermo bed sheets jeep me around 74 farenheit for ne even if the bunk gies to 35 F.

For us Canadian Independent Carriers its difficult to run your truck all night because of diesel prices Across Canada it's averaging $4.75/Gallon. And thats with rhe exchange rate cost.