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Thread: Why your Micra's fuel economy is worse in the winter

  1. #1
    Senior Member Howie's Avatar
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    Why your Micra's fuel economy is worse in the winter

    Anyone else notice thier fuel economy drop in the winter?


        __________________________________________

        click to view fuel log View my fuel log 2015 Micra S automatic: 7.9 L/100 km ... 35.7 mpg (Imp) ... 12.6 km/L ... 29.7 mpg (US) ...


  2. #2
    Not really. But not much of a winter tho..
    I swear I actually got better mileage the other day. ( drove the speed limit due to vertigo lol)

        __________________________________________

        click to view fuel log View my fuel log 2015 Micra S manual: 7.7 L/100 km ... 36.8 mpg (Imp) ... 13.0 km/L ... 30.6 mpg (US) ...


  3. #3
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    Mine is horrible since i put the snow tires on...I don't think the temps have been bad enough, and road conditions aren't bad enough to have a real bad drop at this point. come Feb, Mar they likely will.
    --

        __________________________________________

        click to view fuel log View my fuel log 2015 Micra SV manual: 6.6 L/100 km ... 43.0 mpg (Imp) ... 15.2 km/L ... 35.8 mpg (US) ...


  4. #4
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    Still not complaining really...think i'm averaging around 7.5 for the winter months. maybe 7.75...
    my previous car averaged 10.4-10.7 in the summer!
    --

        __________________________________________

        click to view fuel log View my fuel log 2015 Micra SV manual: 6.6 L/100 km ... 43.0 mpg (Imp) ... 15.2 km/L ... 35.8 mpg (US) ...


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    Administrator MetroMPG's Avatar
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    This topic is worth a dedicated thread. Because I'm the resident fuel economy nerd!

    There are so many factors that conspire against winter vs. summer MPG:

    1) Winter fuel blend has less energy density that summer blend.

    2) Engine takes longer to warm up. This means a richer air/fuel mixture for longer. It also cools off faster, so you're doing more cold starts in multiple daily trips than in the summer.

    3) Auto trans holds higher engine RPM for longer. The car won't shift into top gear until a certain operating temperature, which kills economy.

    4) You're not idling to warm up are you? That's infinity L/100 km / zero MPG and it kills your average.

    5) Higher accessory use due to the cold & dark: eg. fan/defrost/full lights

    6) Higher average lubricant viscosity: engine oil thickens as it cools. So does transmission and differential fluids and even bearing grease. Significantly more energy is needed to overcome the added drag these cold lubricants cause.

    7) Increased rolling resistance from: cold; possibly from your type of snow tires

    7.5) Also ridiculous resistance from that snowy/slushy stuff on the road.

    8) Lower tire pressure: related to the above... you know your tire pressure drops in step with ambient, right? I see a LOT of obviously low tires on cars when the weather turns cold.


    9) Higher aerodynamic drag:
    aerodynamic drag is proportional to air density, and air density increases as temperature drops. For every 10 degree F drop in temperature, aerodynamic drag increases by 2%

    10) Snow/ice on the car: added weight AND worse aerodynamics! Did you clean the snow off your roof? Sure you did.

    There may be even more reasons than these. Some of them have a small impact, and some of them are big. Added together, it's not unusual for the average person to see a 20% drop in winter fuel economy.

        __________________________________________

        click to view fuel log View my fuel log 2015 Micra S manual: 5.0 L/100 km ... 56.5 mpg (Imp) ... 20.0 km/L ... 47.0 mpg (US) ...


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    Daox (01-14-2016),Howie (01-14-2016),L1ghtninchris (01-17-2016)

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    Senior Member Howie's Avatar
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    All very logical reasons! Thank you metro.

        __________________________________________

        click to view fuel log View my fuel log 2015 Micra S automatic: 7.9 L/100 km ... 35.7 mpg (Imp) ... 12.6 km/L ... 29.7 mpg (US) ...


  8. #7
    Senior Member AlphaMicra's Avatar
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    For me, fuel economy got worse because gas is so much cheaper. I love rippin' it, but I think I'm still getting far better fuel economy than I deserve.

    In our culture obsessed with absurd excess, the Nissan Micra is my counterculture car of choice.
    Be sure to visit my blog at mymicra.com!

        __________________________________________

        click to view fuel log View my fuel log 2015 Micra SV manual: 6.4 L/100 km ... 44.3 mpg (Imp) ... 15.7 km/L ... 36.9 mpg (US) ...


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    Member Ajijic's Avatar
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    Why is the fuel economy of an automobile worse in the winter than in the summer?

    Harold Schock, professor of mechanical engineering and the director of the Automotive Research Experiment Station at Michigan State University, explains.

        __________________________________________

        click to view fuel log View my fuel log 2016 Micra Active manual: 6.0 L/100 km ... 46.9 mpg (Imp) ... 16.6 km/L ... 39.0 mpg (US) ...


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  12. #9
    Moderator ptbo micra's Avatar
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    Simple: all the fun in empty parking lots!
    Get your MICRA-FORUM.com decal HERE!!

    Micra Meets: Loyalist Pkwy '15, '16 | Classique d'automne '15 '16 | Forks of the Credit '16 | Mosport '16

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  14. #10
    Administrator MetroMPG's Avatar
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    HA! Handbrakes are fun!


        __________________________________________

        click to view fuel log View my fuel log 2015 Micra S manual: 5.0 L/100 km ... 56.5 mpg (Imp) ... 20.0 km/L ... 47.0 mpg (US) ...


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