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Thread: Fuel Efficient 15-Inch Wheels and Tires

  1. #151
    Senior Member Top_Fuel's Avatar
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    Quote Originally Posted by precisionxt View Post
    Wouldn't the mileage stray further and further the higher mileage you accrue or am I misunderstanding the way this works?
    You are correct.

    It's a 2.5% difference with 185-55-15 tires. So when your odometer says 97500 miles, your car has really gone approximately 100,000 miles. So you get an extra 2500 bonus miles of powertrain warranty coverage.

    I just replaced my tires and went with 185-60-15 this time for the additional height. These tires cause the speedometer to be low by roughly 5.5% (4mph at freeway speeds). When my speedometer (and Scangauge) say 60mph, my GPS says I'm going 64mph. That was my goal because I do a fair amount of freeway driving and I generally keep my RPMs at/below 3000.

    Completely unrelated...but I wonder if anyone has ever checked a 100% stock Mirage with GPS to verify the accuracy of the speedometer calibration?


        __________________________________________

        click to view fuel log View my fuel log 2015 Mirage ES 1.2 manual: 52.1 mpg (US) ... 22.2 km/L ... 4.5 L/100 km ... 62.6 mpg (Imp)


  2. #152
    Senior Member Top_Fuel's Avatar
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    Quote Originally Posted by PityOnU View Post
    ...the difference is so small that it is unnoticeable for day to day driving...
    That's my take, too.

    In case someone missed it, here's a chart from the first post showing Mirage speedometer readings with 185-55-15 tires...

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        __________________________________________

        click to view fuel log View my fuel log 2015 Mirage ES 1.2 manual: 52.1 mpg (US) ... 22.2 km/L ... 4.5 L/100 km ... 62.6 mpg (Imp)


  3. #153
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    Quote Originally Posted by precisionxt View Post
    I don't particularly care about care about speedometer reading so much as my odometer over time. Wouldn't the mileage stray further and further the higher mileage you accrue or am I misunderstanding the way this works?
    Only tangentially related, but if you are worried about breaking the ground truth of odometer accuracy and thus the universe itself, it's worth pointing out that you can make the odometer read whatever the hell you want just by swapping the gauge cluster and there is virtually no way to tell what has happened.

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  5. #154
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    Quote Originally Posted by Mark View Post
    1748mm = 68.82"
    1784mm = 70.24"

    factory tire sizes
    165/65r14 = 70.5" = 1790.7mm
    175/55r15 = 70.9" = 1800.86mm

    Common alternative tire size used
    175/65r14 = 72.1" = 1831.34mm
    185/55r15 = 72.3" = 1836.42mm

    Sharing numbers, but no thoughts.
    I've said this many times, but I feel the Mirage should come with factory 175/65r14 or 185/55r15. These two sizes are a very close match (both 23" outside diameter), & most tire companies in North American offer these two sizes.

    Do Mirages with 165/65r14 (22.4") or 175/55r15 (22.6") factory tires use the same ETACS setting (1748mm or 1784mm)? Don't remember if that's been checked before?

    Quote Originally Posted by Top_Fuel View Post
    That's my take, too.

    In case someone missed it, here's a chart from the first post showing Mirage speedometer readings with 185-55-15 tires...

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    I suspect 165/65r14 tires may run a little lower than actual speed. I wouldn't be shocked if slightly larger 175/65r14 tires were closer to actual speed.

    165/65r14 (22.4"), 175/65r14 (23"), 175/55r15 (22.6"), 185/55r15 (23") - If you are using these sizes, I wouldn't lose sleep over the speedometer/odometer.

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  7. #155
    Senior Member Top_Fuel's Avatar
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    Quote Originally Posted by Mark View Post
    I suspect 165/65r14 tires may run a little lower than actual speed.
    I wouldn't be shocked if slightly larger 175/65r14 tires were closer to actual speed.
    That's what I'm thinking.

    165/65r14 (22.4"), 175/65r14 (23"), 175/55r15 (22.6"), 185/55r15 (23")
    If you are using these sizes, I wouldn't lose sleep over the speedometer/odometer.
    Agreed.

        __________________________________________

        click to view fuel log View my fuel log 2015 Mirage ES 1.2 manual: 52.1 mpg (US) ... 22.2 km/L ... 4.5 L/100 km ... 62.6 mpg (Imp)


  8. #156
    Senior Member precisionxt's Avatar
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    Quote Originally Posted by PityOnU View Post
    Only tangentially related, but if you are worried about breaking the ground truth of odometer accuracy and thus the universe itself, it's worth pointing out that you can make the odometer read whatever the hell you want just by swapping the gauge cluster and there is virtually no way to tell what has happened.
    I think you're right. In the grand scheme of things it's not important, so I just need to get over it. Slightly taller, more-spaced out wheels will improve the driving experience enough to justify it. I don't plan on reselling the car anyway.

        __________________________________________

        click to view fuel log View my fuel log 2015 Mirage ES 1.2 manual: 42.7 mpg (US) ... 18.2 km/L ... 5.5 L/100 km ... 51.3 mpg (Imp)


  9. #157
    Senior Member davidricardo86's Avatar
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    I recently bought a complete set of mint condition 2018 GT 15" wheels/tires for use on my 2015 DE. The GT wheels/tires added a hint of sportiness with slightly better handling at the expense of a little discomfort. I was having trouble finding a replacement 14"x4.5" steel wheel so i decided to go this route instead.

    Compared to the stock 14" setup the ride feels a bit more harsh now. I expect to get slightly worse fuel economy but not by a significant amount. Driving at 60 MPH on the interstate feels more confident, less twitchy, more planted and stable. In order to preserve these wheels i may switch back to the steelies for the winter.

    Edit: I had my local dealer pair the TPMS sensors for $150 (ouch! ). The set cost $300 which also included a spare set of used weather tech floor liners.

    Overall I'm very happy with how everything turned out.

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    Last edited by davidricardo86; 11-23-2020 at 05:47 AM. Reason: Added costs, pics

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  11. #158
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    Quote Originally Posted by davidricardo86 View Post
    I recently bought a complete set of mint condition 2018 GT 15" wheels/tires for use on my 2015 DE.
    Looks real nice.


        __________________________________________

        click to view fuel log View my fuel log 2015 Mirage ES 1.2 manual: 49.8 mpg (US) ... 21.2 km/L ... 4.7 L/100 km ... 59.8 mpg (Imp)


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