early ISX vs S60 vs C15 fuel economy

Discussion in 'Trucks [ Eighteen Wheelers ]' started by Davo81, Apr 11, 2018.

  1. Bean Jr.

    Bean Jr. Road Train Member

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    The bull gear.
     
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  3. swaan

    swaan Road Train Member

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    No more issues then any other engine from those years.
    People have issues with the bull gear because they cheap out and don't replace it at Inframe time. If it's a Reman engine you shouldn't have to look at that till engine needs an inframe.
     
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  4. Davo81

    Davo81 Light Load Member

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    Ahh yes, I’ve heard of that! Is there a way to check if it’s been done?
     
  5. charlie1403

    charlie1403 Bobtail Member

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    I love my 6nz, it is a pleasure to drive. All my work is in hilly country pulling a stock crate and it thrives on it. Yes it is a bit thirsty but I'd rather it cost me a little more in return for having some action when I press the go pedal. I drove an L9000 truck and dog with a 12.7 and it was a bit of a hill detector. But if you're chasing fuel economy above all else then the Detroit is probably the go.
     
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  6. Davo81

    Davo81 Light Load Member

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    Melbourne, Australia
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    Well, it is and it isn’t. From my calculations, fuel is by far and away the big cost in owning a truck (in Australia diesel is about $1.40-1.70/L in the cities), so when you’re talking a minimum of 1mpg difference, that’s adds up to quite a saving by the end of the year. Of course, I’m not going to care if I’m giving a huge amount of performance up for .2mpg.
     
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