Decrease in MPG by 1 point... Tires to blame?

Discussion in 'Ask An Owner Operator' started by Rubys0h0, Oct 15, 2021.

  1. Diesel Dave

    Diesel Dave Last Few of the OUTLAWS

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    I’ve ran a set of Kelly (8) drive’s tall rubber (11.24.5) KDA. Back then I paid $325 each brand new. It was a deal I couldn’t pass up. Had very good luck with them, but like stated above, when they start feathering, it’s time to rotate.
     
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  3. Rubys0h0

    Rubys0h0 Bobtail Member

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    Adjust ECM? I imagine I'd have to pay a visit to freightliner for that?
     
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  4. Rubys0h0

    Rubys0h0 Bobtail Member

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    These were the tires recommended to me by the guy at my local tire shop. They are not LRR so I don't even think I can technically go to California. Pretty pissed about it. Wish I would have done my research before going in.
     
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  5. 77fib77

    77fib77 Road Train Member

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    Yes it's the tires. I lost .5 to 1 mpg when I went to Yoko's from michillin XDN2.
     
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  6. jamespmack

    jamespmack Road Train Member

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    Yes, you could check odometer VS GPS to see if odometer is off. Then just have a simple ecm change.
     
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  7. 77fib77

    77fib77 Road Train Member

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    Also the circumference of the tire is different now. Not 12% different.
     
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  8. Goodysnap

    Goodysnap Road Train Member

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    Thanks, Sir. Your input around here does not go unnoticed. Its OK to disagree with me and show me a thing or two as I dont know it all.

    Everyone has their own preferences on tire pressures. I have never found an advantage to running tires lower than max spec tho anywhere between vehicle spec and tire max pressure rating is a good rule. I choose not to deflate a tire to enhance ride quality as I feel not worth the risk of any accelerated wear that might occur due to underinflation. Generally speaking I have always gotten longer life out of a hard tire.
     
  9. Dave_in_AZ

    Dave_in_AZ Road Train Member

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    I chock most of it up to deeper tread depth. You have much better grip now. More grip = more friction.

    You'll need to average it out over a much longer duration. A good head or cross wind will wreck your mpg for the week.

    A good set of tires with lots of bite is never a bad thing heading into winter.
     
  10. DUNE-T

    DUNE-T Road Train Member

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    Xdn2 is not the best tire for mpg as far as I know. What model Yoko's? They must be really bad then
     
  11. Diesel Dave

    Diesel Dave Last Few of the OUTLAWS

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    I’ve never seen CARB or whoever check for tires if there’re compliant.
     
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