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Idle fuel consumption

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Old Feb 18, 2007 | 06:30 PM
  #16  
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I'd say about 90% of my highway time is at 5AM, on my way to work. On my way home I stick to surface streets, less traffic and 'tards.
 

Last edited by lumbermansvo; Feb 18, 2007 at 06:31 PM. Reason: spelling
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Old Feb 19, 2007 | 09:38 PM
  #17  
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what i'm trying to figure out is that you nap at work in the morning you say for about an hour when you get there, why don't you just sleep the extra hour if you need all this sleep haha, or just turn the key backwards and listen to the radio insted of let it idle.
 
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Old Feb 19, 2007 | 10:18 PM
  #18  
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be sure to change the oil more often-more idling, more breakdown, more friction, less milage
 
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Old Feb 19, 2007 | 10:49 PM
  #19  
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If I left home 30 minutes later I would get to work about 15 minutes before work. I only get 30 minutes more sleep that way.

The way I'm doing it now I get an hour more sleep.

I also hate traffic and would much rather get up 30 minutes earlier to avoid it.
 
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Old Feb 23, 2007 | 12:28 AM
  #20  
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I think I found part of my problem, the trip ODO doesn't work properly!

I just went for a drive to get the kiddo asleep and the reading on the trip ODO didn't change even though I drover several miles.

I will plot my rote to work and home in Google Earth to figure the milage then compare it to what both the ODO's says tomorrow.
 
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Old Feb 23, 2007 | 02:27 AM
  #21  
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well my 5 speed with 4 10's i was getting 8 to 10 mpg and i just replaced then injectors i hope it will make a diffrence
 
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Old Feb 23, 2007 | 06:53 AM
  #22  
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My IP and injectors were replaced about 50k mi ago. The engine was rebuilt about 75k ago.
 
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Old Feb 23, 2007 | 06:50 PM
  #23  
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For a 32 mile trip the trip ODO read 18 miles. YIKES! Didn't check the regular ODO. I'll do that next.

The speedo is accurate according to one those roadside trailer radar things.

Guess I've been getting better milage than I thought!
 
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Old Feb 23, 2007 | 08:31 PM
  #24  
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Originally Posted by CheaperJeeper
Good point. On my trip back from California when I picked up my 4-speed with 4.10s in it I got right about 12 mpg running 3000 RPMs at 65 MPH....

9.6 mpg is pretty low even for 4.10s. Something isn't quite right there.....
wow dont know what gears i have in my 89 f350 CC 4x4 but at 55 its running about 2900 rpms with a 4 speed auto and at that speed on the trip home from where i got it this weekend it got 13.5 mpg PULLING a trailer with a truck on it...which is better than my f250 ext 4x4 with the 460 ever got even with no load!!! gotta love these diesels...
 
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Old Feb 23, 2007 | 09:36 PM
  #25  
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Well, if your odo was CONSISTENTLY reading 18 miles for every 32 you drive, and based on that odo mileage readings you're getting a calculated 9.6 mpg, you are actually getting just a hair over 17 mpg!

(32/18=1.77 and 1.77x9.6=17.07 mpg)

HOWEVER, with 4.10 gears and a C6, I'd be really surprised if you are getting 17 mpg. Mine with the C6 and 3.55s gets between 14.5-16.5 mpg pretty consistently.....
 
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Old Feb 24, 2007 | 12:13 AM
  #26  
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-guess maybe work is farther than you thought too, LOL
 
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Old Feb 24, 2007 | 08:04 AM
  #27  
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I remember in school that diesels will run on fuel ratios of 50/1 idle to less than 6/1 (over fueled pulling tractor belching thick black smoke.
Where a gas engine will only run (without skipping or choking out) at 15/1 idle to 12/1 best power. And all the emissions and computer controls keep it near the stoichometric ratio of 14.7:1, the most effiecient (cleanest burning) ratio.
So to answer your question your diesel burns at least 1/3 less fuel at idle than a similar size gas engine. I dont know how much but if I had to guess I would say around a gallon?
 
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Old Feb 24, 2007 | 11:41 AM
  #28  
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Well, I'll check my regular ODO today and if it isn't accurate then I'll start keeping track of my milage using Google Earth until I can replace the bad parts.
 
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Old Feb 24, 2007 | 04:18 PM
  #29  
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I'd like to figure how much fuel I use idling so I get a more accurate fuel milage number.

I would say that 1/2 a gallon per hour would be close. Most big truck motors use between 3/4 to a gallon per hour. These motors will use more idling then a electronic motor the same size. Nature of the beast..
 
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Old Mar 11, 2007 | 08:37 PM
  #30  
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Well I finally had a pen n the truck today and checked to see if the trip and regular ODO were counting the miles at the same rate. Nope. After just 5.5 miles the trip ODO was slower by .2 miles. When I fill the truck up this Friday I'll have the numbers for the whole week.

Is it possible to just replace the trip odo or do I have to replace the whole assembly?
 
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