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*Very* bad gas mileage in my truck, advice needed.

Discussion in '2nd Gen. Tacomas (2005-2015)' started by Black__cat, Jun 2, 2019.

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  1. Jun 2, 2019 at 1:51 PM
    #1
    Black__cat

    #1
    Black__cat [OP] Well-Known Member

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    2014 Magnetic Grey C-Cab LB TRD Sport 4x4
    2014 TRD Sport 4x4
    Automatic
    6cyl 4.0
    Long Bed
    109k miles.
    Bought used.


    I went from a 4cyl sedan to a 6cyl truck, I knew I'd take a hit to mpg but, not a hit this bad. I did the math over and over again, and even got an ODM reader to output gas mileage for me. I'm. Averaging 10mpg highway, not towing, not in 4-hi. Brand new tires are 17's highway tires with low resistance. I've checked the spark plugs, changed the oil, monitored oil temperature, checked the the air filter and secondary breather filter and, checked the transmission fluid.

    What could be causing the super low mpg?
     
    Black__cat, Jun 2, 2019
    #1
  2. Jun 2, 2019 at 1:52 PM
    #2
    EatSleepTacos

    #2
    EatSleepTacos Well-Known Member

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    My first step would be to clean your MAF and your throttle body. Easy and cheap and fast. Also what tire pressure are you running? What size tires and what load rating? Stock suspension or lifted?
     
    EatSleepTacos, Jun 2, 2019
    #2
    Gunshot-6A, doorsidedown, BassAckwards and 4 others like this.
  3. Jun 2, 2019 at 1:55 PM
    #3
    Northern Taco

    #3
    Northern Taco Well-Known Member

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    I've been through 2 sticking front calipers in 2 years. Check for hot wheels after driving
     
    Northern Taco, Jun 2, 2019
    #3
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  4. Jun 2, 2019 at 1:55 PM
    #4
    Lawfarin

    #4
    Lawfarin Who me?

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    Double check your math

    Try some fuel injector cleaner

    Air filter replacement

    Clean your MAF

    New spark plugs
     
    Lawfarin, Jun 2, 2019
    #4
    Lester Lugnut, Gunshot-6A, BassAckwards and 7 others like this.
  5. Jun 2, 2019 at 1:56 PM
    #5
    BillsSR5

    #5
    BillsSR5 Looking out for #1

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    BillsSR5, Jun 2, 2019
    #5
    Fearthisbeard, Crodell6, Black__cat[OP] and 1 other person like this.
  6. Jun 2, 2019 at 1:57 PM
    #6
    TheDevilYouLove

    #6
    TheDevilYouLove You can’t polish a turd, but you can polish a TRD

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    Change rear differential fluid
     
    TheDevilYouLove, Jun 2, 2019
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  7. Jun 2, 2019 at 2:17 PM
    #7
    Black__cat

    #7
    Black__cat [OP] Well-Known Member

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    Stock suspension, 265/65/R17, "the correct" psi, they were filled by the shop that mounted them. Not sure of the load rating.

    Can you point me in the right direction for how to clean the MAF and throttle body?
     
    Black__cat, Jun 2, 2019
    #7
  8. Jun 2, 2019 at 2:17 PM
    #8
    Black__cat

    #8
    Black__cat [OP] Well-Known Member

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    Ill check this. Thanks.
     
    Black__cat, Jun 2, 2019
    #8
  9. Jun 2, 2019 at 2:18 PM
    #9
    Black__cat

    #9
    Black__cat [OP] Well-Known Member

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    Will do this next. Thank you.
     
    Black__cat, Jun 2, 2019
    #9
    Crodell6 likes this.
  10. Jun 2, 2019 at 2:19 PM
    #10
    Black__cat

    #10
    Black__cat [OP] Well-Known Member

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    Air filter is brand new, injector cleaner has been applied. Math has now been triple checked.
     
    Black__cat, Jun 2, 2019
    #10
    Lawfarin[QUOTED] likes this.
  11. Jun 2, 2019 at 2:19 PM
    #11
    CTtoNoVa

    #11
    CTtoNoVa Well-Known Member

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    Pop N Lock
    It should be behind the air box. It’s very easy. Just buy MAF and throttle body cleaner. Once you have everything off you can clean both fairly quickly. Just YouTube it if you need some pointers
     
    CTtoNoVa, Jun 2, 2019
    #11
    TRDSport10 and Black__cat[QUOTED][OP] like this.
  12. Jun 2, 2019 at 2:20 PM
    #12
    EatSleepTacos

    #12
    EatSleepTacos Well-Known Member

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    I’d double check tire pressure first as that’s the easiest. Go off of the door jamb for proper numbers.

    https://www.tacomaworld.com/threads/how-to-throttle-body-cleaning-2005-v6.94203/
     
    EatSleepTacos, Jun 2, 2019
    #12
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  13. Jun 2, 2019 at 2:37 PM
    #13
    Fullboogie

    #13
    Fullboogie Well-Known Member

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    LOL, that's your first go-to?
     
    Fullboogie, Jun 2, 2019
    #13
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  14. Jun 2, 2019 at 2:39 PM
    #14
    Black__cat

    #14
    Black__cat [OP] Well-Known Member

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    Sorry, totally new to this/these truck(s) and this community. Is his suggestion inadvisable?
     
    Black__cat, Jun 2, 2019
    #14
  15. Jun 2, 2019 at 2:42 PM
    #15
    CTtoNoVa

    #15
    CTtoNoVa Well-Known Member

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    Do the throttle body and MAF first. It’s pretty easy and go from there... path of least resistance...
     
    CTtoNoVa, Jun 2, 2019
    #15
    Gunshot-6A, Norton and whatstcp like this.
  16. Jun 2, 2019 at 2:44 PM
    #16
    Black__cat

    #16
    Black__cat [OP] Well-Known Member

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    In cleaning the MAF, correct me if I'm wrong, but I can just pull it from its housing and hose it with MAF cleaner right?
     
    Black__cat, Jun 2, 2019
    #16
    Skyway likes this.
  17. Jun 2, 2019 at 2:46 PM
    #17
    SR-71A

    #17
    SR-71A Define "Well-Known Member"

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    haha right?
    It cant hurt, especially on a used truck that you probably dont know the service history of.. But I don't see how it would cause a significant drop in mpg's without grenading the rear end at the same time
     
    SR-71A, Jun 2, 2019
    #17
    Gunshot-6A, BassAckwards and Norton like this.
  18. Jun 2, 2019 at 2:47 PM
    #18
    SR-71A

    #18
    SR-71A Define "Well-Known Member"

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    Also, like randy said, check the tire pressures yourself too as an easy 1st step
     
    SR-71A, Jun 2, 2019
    #18
    BassAckwards, Norton and EatSleepTacos like this.
  19. Jun 2, 2019 at 2:47 PM
    #19
    CTtoNoVa

    #19
    CTtoNoVa Well-Known Member

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    Pop N Lock
    Make sure you let it dry for a good hour and it’s off the vehicle first.
     
    CTtoNoVa, Jun 2, 2019
    #19
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  20. Jun 2, 2019 at 2:49 PM
    #20
    jkuniverse

    #20
    jkuniverse Well-Known Member

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    In addition to what’s already mentioned... I would also check the wheel alignment.
     
    jkuniverse, Jun 2, 2019
    #20
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