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Gas Mileage vs Weather Changes

Discussion in '3rd Gen. Tacomas (2016+)' started by sabre170, Nov 8, 2019.

  1. Nov 8, 2019 at 7:09 AM
    #1
    sabre170

    sabre170 [OP] Well-Known Member

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    -2016 2WD Tacoma V6


    "Winter" months have started to show up in Texas. Oddly, I've noticed that like flipping a switch, my gas mileage has dropped about 4mpg highway over the past 3 weeks. Almost like clockwork with some cold fronts that passed through.

    Curious if anyone else notices their gas mileage effected this much by changing weather.

    I realize that I'm now in the months of "winter blend" fuel, and winter blend fuel does get worse gas mileage, but I'm noticing a 15-20% decrease in mileage. That seems a bit extreme just for gas blend changes, no?
     
  2. Nov 8, 2019 at 7:14 AM
    #2
    Chew

    Chew Not so well known user

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    Historically my mpgs drop by several. For me, probably multiple factors adding up.
    • Winter blend fuel
    • Using remote start (sparingly, but still)
    • Longer warm up times burn more
    • It's dark earlier, when I use my truck, I'm taking shorter trips (more city driving)
     
  3. Nov 8, 2019 at 7:36 AM
    #3
    shakerhood

    shakerhood Well-Known Member

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    Winter blend fuel just dropped my truck from around 22 down to 20.
     
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  4. Nov 8, 2019 at 7:39 AM
    #4
    fiftyxp

    fiftyxp Well-Known Member

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    this is my first "texas winter" with a tacoma and I just noticed this. i was 16ish city im 13 14 now.
     
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  5. Nov 8, 2019 at 7:39 AM
    #5
    Pablo8

    Pablo8 Holiday Taco

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    Winter fuel. Bingo!! Always good for a couple in my cars. Tacoma down 2 MPG or so.
     
  6. Nov 8, 2019 at 7:43 AM
    #6
    InfernoChalupa

    InfernoChalupa Using CRAWL control on Bunny Trails

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    Must not have switched out your summer air in your tires yet!
     
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  7. Nov 8, 2019 at 7:45 AM
    #7
    LTG4087

    LTG4087 Well-Known Member

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    For sure there is decline in MPG in the winter, especially so if you do a lot of short trips where it takes half of the trip just to get up to temp. My daily trip to the gym is 3.9 miles through town. In the summer I'll average about 19.5 - 20 MPG if I don't get stopped by a train. Winter time, same trip runs at 16 - 17 MPG. On longer trips with more time at running temp it's not as noticeable, but still the winter gas drags it down about 1 MPG.
     
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  8. Nov 8, 2019 at 7:49 AM
    #8
    sabre170

    sabre170 [OP] Well-Known Member

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    haha... this was actually my first thought. Tire pressure is all good.

    Yeah, 90% of my driving is on the interstate. I usually get 22-24 on the highway. I'm now getting 18-20

    I'm shocked winter fuel blend can make this big of a difference.
     
    InfernoChalupa likes this.
  9. Nov 8, 2019 at 7:52 AM
    #9
    SDTaco4x4

    SDTaco4x4 Well-Known Member

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    I don't know if it's a thing with these engines but my truck HATES winter gas. I also see huge MPG drops that I've never seen with any other vehicle.
     
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  10. Nov 8, 2019 at 7:53 AM
    #10
    tacomaccountant

    tacomaccountant Well-Known Member

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    Interesting. I noticed a small drop on my last fillup. I did my small lift and tires back in April so this will be the first cold weather with my current setup. I am running around 17.5 now.
     
  11. Nov 8, 2019 at 8:19 AM
    #11
    WZ00R2

    WZ00R2 Well-Known Member

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    For those getting poor cold weather mileage, check your tire pressure. You’ll need to add air compared to summer month driving.
     
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  12. Nov 8, 2019 at 10:42 AM
    #12
    Tacowin1013

    Tacowin1013 Well-Known Member

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    Winter blend gas and decreased efficiency in colder temps, im currently getting about 16mpg in the city. That, and i remote start about 5 mins before I leave on 1st start up. All pretty routine.
     
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  13. Nov 8, 2019 at 11:02 AM
    #13
    pinem56

    pinem56 Well-Known Member

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    My experience is that the drop in mileage is almost completely due to cold weather and the time it takes for the engine to warm up. In the fall and spring where I live, its not uncommon to have temps below freezing one day, and the next day, temps in the 60s. On the same tank of gas, and same routes, I'll see mileage go from 19 on average to 15 on average with a 30 to 40 degree ambient temp change. It appears the engine runs very inefficiently when it is cold, and it takes a long time for the engine to get up to normal operation temp with below freezing temps. I can drive 5 miles in city stop and go traffic, and still not get my engine up to temp by the time I arrive at my destination.

    If you look at the eco guage, when it is cold, you will see that the mpg is quite low for the first 4 to 5 minutes of driving, then all of a sudden, the mpg will start to increase back to what one would normally see under normal operation. If I had to guess, the Atkinson cycle probably doesn't come online until the engine reaches a certain temp. Everything I have seen with my truck indicates the engine runs very inefficiently when in Otto cycle.
     
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  14. Nov 8, 2019 at 11:05 AM
    #14
    sunchip89

    sunchip89 Well-Known Member

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    Excellent answer, gasoline has the same energy content throughout the year. They just increase the RVP during the cold months
     
  15. Nov 8, 2019 at 11:06 AM
    #15
    GreyBaldTaco

    GreyBaldTaco Well-Known Member

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    Make sure to change out your diff fluid to winter blend as well, helps keeps everything lubed right.
     
  16. Nov 8, 2019 at 11:07 AM
    #16
    Tcomaboy

    Tcomaboy Well-Known Member

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    Also don’t forget to change your blinker fluid to winter blend
     
  17. Nov 8, 2019 at 11:14 AM
    #17
    Rock Lobster

    Rock Lobster The Ignore button is for weaklings.

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    Check tires, as already mentioned.

    Also, pay attention to the time change. People are groggy and its going to subtly change the traffic patterns around town. If you start watching for it you'll notice that a lot more people than usual are mindlessly tapping the brakes when rolling in traffic. Those little bitty speed corrections kill mileage way more than weather or fuel blends.

    My mileage started piss poor after the first cold front, but its back up to almost normal now.
     
  18. Nov 8, 2019 at 11:17 AM
    #18
    fiftyxp

    fiftyxp Well-Known Member

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    what psi is everyone running?

    k02s specifically?
     
  19. Nov 8, 2019 at 11:17 AM
    #19
    Genypig

    Genypig Well-Known Member

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    I was getting 20-21 mpgs during the warmer months and now I'm seeing 16-18 mpgs. Kansas got hit hard with winter weather pretty quickly. So I noticed the change in MPG's immediately. I don't know much about winter fuel blend, but if that's the case, then it makes sense. Also, I'm guessing that the colder air temps affect the fuel efficiency in various ways.
     
    shakerhood likes this.
  20. Nov 8, 2019 at 11:20 AM
    #20
    Cudgel

    Cudgel “Tonka”

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    Yes winter gashole does that. Or perhaps the 6 inch lift and E rated 38”s you put on before you participated in Street Outlaws last night had something to do with it?
     

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