It supposedly burns 0.1 gph which saves me a lot of money but yes it does have high maintenance only if it's abused. Thankfully I have an APU, when it works which is 90% of the time I don't burn much. It was a different time.Ĭlick to expand.That would end up being $720 a month if it's the summer and hot all day and night which is pretty bad. The corporate attitudes in those days is just run it and shut up about getting a APU on. I know very little about APUs in my time everyone laughed and say they are fancy and take too much weight and required maintaince etc. My knowledge is dated, there are too many variables in what a company truck might or might not allow a driver to do and that can be a problem. We usually idled at 1000 for overnight most of the time it's a huge Z generator and charges the battery etc and heat or cooled nicely. Fuel is life and having a engine going is the same. And even with max heat and a winter front when it's -50 outside the cab is barely habitable with full jackets, layers etc. Trucks we had in our time during winter out west or north we would have them at 1500 set. Thoughts?Ĩ gallons at 3 dollars per is 24 dollars. Now I realize that low idle is not good but how low is too low? I don't have a DPF or any of the emissions equipment so could lowering the idle to 620 do damage? I'd like to lower it to that because of the fuel saving and the lack of idle vibration but obviously I don't want to do this if it's going to do damage. Well I noticed when I dropped it down to 620 RPM it was a very very very smooth idle, much smoother than I've ever felt this truck idle and the idle fuel usage went from 0.8mpg to 0.6mpg. I rarely idle because I use my APU but I have a freon leak so I've been idling a bit lately. It always sounded like it was too high but it was like that since forever so I didn't bother with it. Ever since I bought the truck it idled at 700 RPM even after I had it deleted and tuned. I knew that if I turn the cruise control to on, and hold set, I can raise the RPM which is what I figured I had done but my cruise was off so I began pushing the Resume-Set button and found that I could raise or lower the idling RPMs. I thought something just broke on the engine or an injector stuck or something. While waiting around for my trailer to be loaded in my 2015 KW T680 with the Cummins ISX, I started beating (lightly) on my cruise control buttons to the beat of the song I was listening to and the idle raised a little.
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