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MPG worse after tuneup

Discussion in '2nd Gen. Tacomas (2005-2015)' started by patos tacoma, Dec 16, 2020.

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  1. Dec 16, 2020 at 1:59 PM
    #1
    patos tacoma

    #1
    patos tacoma [OP] Well-Known Member

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    Changed plugs (OEM Toyota), PCV valve, refurbished coils, changed Valve cover gaskets, new Air filter, and cleaned MAF.....

    getting 18 on the highway, instead of 20 with all my old stuff.....

    any ideas?
     
    patos tacoma, Dec 16, 2020
    #1
  2. Dec 16, 2020 at 2:07 PM
    #2
    spitdog

    #2
    spitdog Well-Known Member

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    Winter gas
     
    spitdog, Dec 16, 2020
    #2
    tacotoe, Tacos4ever15, Blockhead and 8 others like this.
  3. Dec 16, 2020 at 2:07 PM
    #3
    Soylent Green2012

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    Soylent Green2012 RestoRides MotorSports

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    Try disconnecting the battery for 24 hours and then see if it re-learns or re calibrates.
     
    Soylent Green2012, Dec 16, 2020
    #3
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  4. Dec 16, 2020 at 2:09 PM
    #4
    T-yoda

    #4
    T-yoda Well-Known Member

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    I don’t do mpg monitoring ..... it'll drive ya nuts along with all your TW buddys
     
    T-yoda, Dec 16, 2020
    #4
    desertrunner24, tacotoe, Blockhead and 3 others like this.
  5. Dec 16, 2020 at 2:13 PM
    #5
    MR5X5

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    MR5X5 Well-Known Member

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    MAF cleaning = recalibration
     
    MR5X5, Dec 16, 2020
    #5
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  6. Dec 16, 2020 at 2:14 PM
    #6
    Alexely999

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    Alexely999 Well-Known Member

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    Winter gas, or were the plugs copper?
     
    Alexely999, Dec 16, 2020
    #6
  7. Dec 16, 2020 at 2:15 PM
    #7
    b_r_o

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    b_r_o Gnar doggy

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    Did you use an oiled K+N air filter?
     
    b_r_o, Dec 16, 2020
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  8. Dec 16, 2020 at 2:16 PM
    #8
    fixnfly

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    fixnfly Well-Known Member

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    I do whatever I can to keep my truck in good condition. Accepting shitty gas mileage is necessary with a 4.0
     
    fixnfly, Dec 16, 2020
    #8
    tacotoe, outxider, SR-71A and 1 other person like this.
  9. Dec 16, 2020 at 2:16 PM
    #9
    spitdog

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    spitdog Well-Known Member

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    I can see when my winter gas effects my mileage.

    917196E8-5E74-404E-8BC5-5D9EA849385E.jpg
     
    spitdog, Dec 16, 2020
    #9
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  10. Dec 16, 2020 at 2:22 PM
    #10
    aficianado

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    aficianado Well-Known Member

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    bay area, california
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    back to bone stock.
    drive it a bit more. i bet it settles back in to something you recall.
     
    aficianado, Dec 16, 2020
    #10
    Jimmyh likes this.
  11. Dec 16, 2020 at 2:31 PM
    #11
    patos tacoma

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    patos tacoma [OP] Well-Known Member

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    Don’t have winter gas here in TX.....
    The plugs I replaced were Denso coppers, bought at Toyota dealer just like the ones prior, and from the manual @40k

    Plus I disconnected battery when I did all the work, so I guess it’s re learning.

    throttle body was cleaned by dealer 15k ago, so maybe I take another look at that?
     
    patos tacoma, Dec 16, 2020
    #11
  12. Dec 16, 2020 at 4:06 PM
    #12
    Jimmyh

    #12
    Jimmyh Well-Known Member

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    All states are under a federal mandate to use Summer / Winter formulated gasoline...

    https://www.epa.gov/gasoline-standards/federal-gasoline-regulations
     
    Jimmyh, Dec 16, 2020
    #12
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  13. Dec 16, 2020 at 4:27 PM
    #13
    gotoman1969

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    gotoman1969 Well-Known Member

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    Yep, we sure do.
     
    gotoman1969, Dec 16, 2020
    #13
  14. Dec 16, 2020 at 5:19 PM
    #14
    No Shoes Nation

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    No Shoes Nation Well-Known Member

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    Hmm . . . none as yet, that's why i'm here . . .
    yaw truck got the Covid . . .
     
    No Shoes Nation, Dec 16, 2020
    #14
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  15. Dec 16, 2020 at 5:31 PM
    #15
    Dalegribble02

    #15
    Dalegribble02 Well-Known Member

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    I drive a truck I don't care about mpg's
     
    Dalegribble02, Dec 16, 2020
    #15
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  16. Dec 16, 2020 at 5:45 PM
    #16
    PinktacoDM84

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    PinktacoDM84 Well-Known Member

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    Lol I love this throwaway line.

    it’s a Tacoma, not a tundra.
     
    PinktacoDM84, Dec 16, 2020
    #16
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  17. Dec 16, 2020 at 5:55 PM
    #17
    patos tacoma

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    patos tacoma [OP] Well-Known Member

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    Well, I got 2 other vehicles that don’t know the difference......both runnin on Premium (required)...
    Only reason I care is because I drive between Dallas and Houston every week.....the truck is for that drive and the difference is really in Range, and not having to stop for gas enroute.
     
    patos tacoma, Dec 16, 2020
    #17
    Toyko Joe likes this.
  18. Dec 16, 2020 at 5:58 PM
    #18
    gotoman1969

    #18
    gotoman1969 Well-Known Member

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    I lose about 2mpg this time of year. Damn those regulations!!!
     
    gotoman1969, Dec 16, 2020
    #18
  19. Dec 16, 2020 at 6:12 PM
    #19
    SR-71A

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    SR-71A Define "Well-Known Member"

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    Where exactly does that link talk about summer v winter gas? Ive always wondered if this was actually true or not. Personally always attributed winter MPG loss to more engine warm-up time and less efficiency while the engine takes longer to warm up. But would be curious to know if theres an actual dot gov site saying something about it
     
    SR-71A, Dec 16, 2020
    #19
  20. Dec 16, 2020 at 6:22 PM
    #20
    gotoman1969

    #20
    gotoman1969 Well-Known Member

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    Found the EPA regulates emissions. Couldnt find mandates. It has to to with emissions in each state. Winter blends are more volatile helping with ignition in colder temps. Some states run these blends year round some only during winter. Hence why sometimes you here summer/winter blends.
     
    gotoman1969, Dec 16, 2020
    #20
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