Replaced Tires with non-LRR tires gas mileage horrible 50 mpg to 37 mpg please help!!

Discussion in 'Prius c Main Forum' started by William C Adams, Jun 22, 2020.

  1. William C Adams

    William C Adams Junior Member

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    Location:
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    Vehicle:
    2014 Prius c
    Model:
    Three
    I thought gosh I could save money and buy my tires online then have the local tire shop install them and save money. So I got on amazon and found the same size tire for my 2014 Prius C and thought c'mon its just a tire and if the tread depth is the same, width, height etc etc. that I wouldn't have any problem and that my car would smile and thank me.

    Instead, my car's battery hasn't been charging above 2 bars and I've got new tires but my mileage city went from 50 to 37 and it was ever since I put new tires on my car. After having over 1,200 miles put on the car and a few gas tanks I'm concerned.

    I know that every 10K miles my tires need to be rotated according to the computer on my dash as it alerts me. As soon as I saw that notification instead of rotating my tires I replaced them. That notification is still on. Do I need to find on youtube how to reset it ?

    I didn't know the difference in LRR tires compared to HRR tires I didnt know that was a big deal and went with whatever amazon recommended.

    Please help.

    Thank you
     
  2. iceman13

    iceman13 Member

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    Unless they are a different size, installing regular tires instead of LRR ones should not have such a dramatic impact on mpg. I bought cheap Nankang tires from Amazon in the original size and I still get 50mpg.

    I’m more concerned about your battery not charging above two bars. That is the real problem. It might just be a coincidence with the tires.
     
    jerrymildred and dig4dirt like this.
  3. dig4dirt

    dig4dirt MoonGlow

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    Yes something is wrong with the two bars.
    Not driving in "B" are you?

    How many miles on odo?
     
  4. sam spade 2

    sam spade 2 Senior Member

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    This.
    Just because the drop in mileage LOOKS like it is obviously connected to the new tires does NOT mean that is really true.
    I think the most change that has been reported with non-LRR tires is around 5 MPG.
    Having "soft" tires and not inflating enough might add a couple more to the loss.
     
  5. bisco

    bisco cookie crumbler

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    how many miles on her?

    who installed the tires?

    what brand and model?

    what did they cost?
     
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