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Mileage drop with new tires

Discussion in 'Prime Care, Maintenance and Troubleshooting' started by High Mileage, Oct 25, 2020.

  1. Dave deBronkart

    Dave deBronkart Junior Member

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    OK, study completed, conclusion drawn and confirmed!
    • Baseline mileage with A41 had been 53
    • Michelin Defenders at normal inflation only gave me 45
    • Overinflated the Defenders by 4# and ran for 2600+ miles. 49.8 mpg.
      upload_2024-9-12_21-56-14.png
    • Bought a new set of A41s and installed them yesterday. First 117 miles: 55.0 mpg.
      upload_2024-9-12_22-0-56.png
    It's important to me that everyone I talked to at any garage or tire store knew nothing about this issue. They all just kinda shrugged. Certainly all the tire-store "we've got the right tires for your car" search apps are completely unaware. Big problem!

    I'm leaving on a 1000 mile trip tomorrow - will report back.

    How do we get those apps & in-site search tools to wise up??
     
    bisco likes this.
  2. bisco

    bisco cookie crumbler

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    unfortunately, they'll never wise up until enough customers demand tyre mpg info, or we have rolling resistance specs from the epa
     
    Dave deBronkart likes this.
  3. Dave deBronkart

    Dave deBronkart Junior Member

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    XLE AWD-e
    Yep: it was a pretty brutal trip, mix of highway and nasty weekend beach traffic - it normally takes 7-8 hours, actually took 11, then had ten on the way home. But it netted out at 54.5 mpg. Love dem new tires!!

    upload_2024-9-24_21-27-36.png
     
    MAX2 likes this.
  4. MAX2

    MAX2 Member

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    I wonder if the fuel consumption indicated was true to actual fuel consumption?
    How many gallons were used for that distance?
     
  5. Mendel Leisk

    Mendel Leisk Senior Member

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    4th Gen still exaggerates mpg, as does Gen 3, from what I’ve read here. Our Gen 3’s display is about 7% optimistic, on average. 5th Gen apparently is accurate.

    that said, it’s still handy, for comparison, but you need to take it with a grain of salt.