Stepping Out With My Own Numbers

Discussion in 'Ask An Owner Operator' started by Misesian, May 16, 2017.

  1. Misesian

    Misesian Road Train Member

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    New International LT with their new A26 motor

    410 hp 1450/1650 torque
    6x2
    Super singles
    APU
    2.5 ratio
    10 speed direct Fuller Advantage manual
    Cruise at 60 mph, 1300 rpm
     
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  3. Misesian

    Misesian Road Train Member

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    International LT with their new A26 motor.

    The specs are important but I have a certain way of driving I’m sure a lot of people would not like or enjoy. I only use 200hp for accelerating or climbing and cruise at 60. I only use cruise control if I’m bobtail. Using gravity to my advantage as much as I can. It takes a lot of work to hit these numbers.

    If you read some old articles by Bruce from Pittsburgh Power, he talks about many of the strategies I use regarding fuel mileage, they were in 10/4 magazine; that’s where I learned this stuff. Also reading some of Henry Albert’s posts on Team Run Smart are very informative. The goal is always to minimize boost as much as possible. You get great results but it’s not a lot of fun.
     
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  4. Misesian

    Misesian Road Train Member

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    After owning two ISX, I wouldn’t buy another. I only recommend Cummins if you’re in an application where you’re heavy haul, 110k or greater most of the time. Otherwise, any of the proprietary 13l motors will do the job just fine. My big complaint about Cummins is the soot. I don’t know what they did, but both of the units I had were so full of soot and sludge. The one I drove was maintained to the T. I even had all the maintenance history from the previous fleet and that still wasn’t enough.
    They are really hyping the new X15 but they haven’t convinced me they’ve solved the soot problem.
     
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  5. Misesian

    Misesian Road Train Member

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    I think if I were running a downsped Setup where I’m cruising at 1100-1150 it wouldn’t. I’m running at 1300 rpm. That’s a good rpm for hauling freight but not for bobtailing or empty.
     
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  6. RStewart

    RStewart Road Train Member

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    I don't see how you run without the cruise. Lol. I have a hard time maintaining speed on the foot. I'd be pulling Monteagle at 15-20 mph if I kept my boost under 20 psi. I might try messing with it. I have a scan gauge that has some good info on it but I haven't tried using it as a tool really. I need to learn more about what it's telling me.

    I turn 1200 at 60 and I get better fuel mileage dead heading than I do loaded. But I don't run 60 very often.
     
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  7. Misesian

    Misesian Road Train Member

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    Your boost will vary based on displacement. If you have a 15l, 20-22 will be 200hp. With a 13l it’s 27-28.
    I used a scangauge when I had a truck with no gauges. It helps a lot by keeping you focused on hp and boost. Additionally you can watch your GPH and determine what rpm yields the lowest GPH.
    When I go over Monteagle, my lowest speed is usually around 30 mph. That doesn’t last too long before the 200hp starts to accelerate again. You don’t get anywhere fast but it definitely helps mpg. More speed means more HP to both hit that speed and maintain it; more hp always equals more fuel.
     
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  8. RStewart

    RStewart Road Train Member

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    I use the scan gauge to watch boost mainly. I need to pay attention to the GPH as well. I have no idea what all the other stuff is. Lol. Well, the stuff that isn't self explanatory. Lots of abbreviations with dollar symbols and I have no clue what they are. I was surprised the paperwork with it didn't tell me either.

    I have a 15L Cummins, 13 speed and 3:23 rears on 295R75-22.5 tires. The truck is a KW T660. There's a significant difference in fuel mileage between 60 mph and 67 mph. Lol. I usually run 65 most of the time. With my idle time which is every night there whole time I'm parked, I'm averaging 6.67 mpg for the last 90 days. The majority of that was ran at 67-68 mph. I started staying at 65 about 3 weeks ago. I have ran 60 in there some.

    I'm getting an APU installed as I type this so I'm sure that will help with the fuel mileage but the savings from there will go to pay for the APU. So it's kind of a trade off.
     
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  9. Misesian

    Misesian Road Train Member

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    APUs will save fuel but, more importantly, it will save you thousands in maintenance on the EGR system.
     
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  10. TallJoe

    TallJoe Road Train Member

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    I also noticed that winter mpg and summer mpg is like a day and night difference. While I am able to stay slightly above 7 mpg now in Summer, during Winter time it is at least 1 mpg less. It has to be related to Winter weather conditions - winds and wet roads, but also lesser BTU in winterized fuel (?).
     
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  11. Oscar the KW

    Oscar the KW Going Tarpless

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    Winter fuel doesn’t yield the same efficiency as summer fuel. Also, cold air is more dense and harder to push thru.
     
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