I'm finding the general consensus at only 1 gal/idle hour. Seems low. Anyone have hard data?
gallons per idle hour?
Discussion in 'Experienced Truckers' Advice' started by CaptainKirk, Apr 3, 2013.
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Most of the time its actually less than 1 gallon per hour. No hard data other than I am the one that buys and pays for fuel.
Chipperrr, 86scotty, KANSAS TRANSIT and 2 others Thank this. -
We used to have a driver that would stay at the Hook 30 miles from his house and idle over night because he said he didn't want to wake everyone up when he got home. His "thoughtfulness" cost ~$40/night.
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It's around a gallon per hour at recommended idle RPMs, Volvo idles at a lower RPM so it would be somewhat less than that.
The ISX was supposed to idle at 800, the DD15 at 900, n-14s were dropped back to 900 from 1100.
Series 60 should have been 800 to 900 Not sure about Cats but slow idle wasn't recommended by most manufactures for long periods of time.
In the Series 60s, low oil pressure took out the turbo bearings at slow idle. I'm thinking most other engines would have that same problem, along with other problems.Chipperrr, Cabinover101, rabbiporkchop and 6 others Thank this. -
Chipperrr and chopper103in Thank this.
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Chipperrr Thanks this.
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So... figure on 0.8 g/h, a 10 hour break every day, and 51 weeks per year, 6 days per week... that's 2448 gallons of fuel every year. Take your own fuel price, but I'll use $4/gallon - that's $9792.00 per year - every year to idle. Kinda makes that APU look a little more affordable.
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Ive only had ISXs. Dash readout went between .5 and .8 gph.
Chipperrr Thanks this. -
Really? 10 hrs every day? Really
As far as your numbers go its very convincing...except for one tiny thing. Correct me if I'm wrong, but I belive that diesel powered APU's use ( burn ) diesel. Number of .3 g/hr comes to mind. So using your high number of .8 g/hr you save .5g/hr. Its $ 2. Assuming 2000 hrs idled a year that's 4k savings. I don't know how much routine maintenance will run you but it got to be at least 500 a year. So you'll save about 3500 a year. Since new APU will run you north of 10k we talking 3 years till break even point. And that's without a penny for repairs. How likely is that?. So run that no brained part by me again, cause I don't get it.Chipperrr, ncmickey and Aamcotrans Thank this. -
It is also said that one hour of idle is equal too 100mi of driving. Ive heard this from many mechanics and on a lot of trucking radio. So other than paying for fuel you also have to change oil sooner and put un compensated wear on your engine.
Cabinover101 Thanks this.
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