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Bad mpg

Discussion in '2nd Gen. Tacomas (2005-2015)' started by Bmerr222, Mar 13, 2019.

  1. Mar 13, 2019 at 9:22 AM
    #1
    Bmerr222

    Bmerr222 [OP] Member

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    4 inch lift,33/12.50r18, muffler delete,etc
    I have a 2010 4.0l Tacoma trd. 4 inch lift 33s and muffler delete still has cats. I’m getting about 7 mpg I changed spark plugs but am wondering why my gas mileage is still so bad?
     
  2. Mar 13, 2019 at 9:23 AM
    #2
    Gunshot-6A

    Gunshot-6A In God We Trust; All Others We Monitor

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    Plus winter gas.
     
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  3. Mar 13, 2019 at 9:25 AM
    #3
    Bmerr222

    Bmerr222 [OP] Member

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    4 inch lift,33/12.50r18, muffler delete,etc
    Don’t think I have winter gas in my area
     
  4. Mar 13, 2019 at 9:26 AM
    #4
    JaCado

    JaCado Well-Known Member

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    What tire pressure are you running on that lifted brick??
     
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  5. Mar 13, 2019 at 9:27 AM
    #5
    Bmerr222

    Bmerr222 [OP] Member

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    4 inch lift,33/12.50r18, muffler delete,etc
  6. Mar 13, 2019 at 9:28 AM
    #6
    JaCado

    JaCado Well-Known Member

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    Head winds prevalent in the area?
    You travel both ways up hill??
     
  7. Mar 13, 2019 at 9:29 AM
    #7
    Ossaris

    Ossaris A Bad Person Doing Good Things

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    Have you tried checking the blinker fluid? I know that can weigh the truck down quite a bit actually...

    If that doesn't work, I'd recommend doing an exhaust redirect. It helps your air intake and usually doubles MPG
     
  8. Mar 13, 2019 at 9:30 AM
    #8
    Bmerr222

    Bmerr222 [OP] Member

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    Not very windy but there are a good bit of hills in my area. Anyone think it could be o2 sensor or clogged cat?
     
  9. Mar 13, 2019 at 9:31 AM
    #9
    Bmerr222

    Bmerr222 [OP] Member

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    4 inch lift,33/12.50r18, muffler delete,etc
    Blinker fluid in tact so aren’t my muffler barrings
     
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  10. Mar 13, 2019 at 9:31 AM
    #10
    Ossaris

    Ossaris A Bad Person Doing Good Things

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    You a lead-foot? If you're pushing that pedal down like a racecar, that may contribute to the issue...
     
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  11. Mar 13, 2019 at 9:32 AM
    #11
    Bmerr222

    Bmerr222 [OP] Member

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    4 inch lift,33/12.50r18, muffler delete,etc
    No I’ve been driving easy. Forgot to add it’s a 6 speed manual
     
  12. Mar 13, 2019 at 9:36 AM
    #12
    Gunshot-6A

    Gunshot-6A In God We Trust; All Others We Monitor

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    Plus 4" lift and 33s. That doesn't shock me.
     
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  13. Mar 13, 2019 at 9:38 AM
    #13
    desertrunner24

    desertrunner24 Well-Known Member

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    Have you done any other maintenance besides plugs. Like throttle body, maf, trans fluid drain and fill, injector cleaning etc?
     
  14. Mar 13, 2019 at 9:38 AM
    #14
    Bmerr222

    Bmerr222 [OP] Member

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    I don’t think it should be getting 6-7 mpg though
     
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  15. Mar 13, 2019 at 9:40 AM
    #15
    desertrunner24

    desertrunner24 Well-Known Member

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    Also how many miles? 4x4 or 2wd?
     
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  16. Mar 13, 2019 at 9:41 AM
    #16
    NunyaBizness

    NunyaBizness JBFC

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    Do you have a truck full of trolls? Cuz they are quite heavy and WILL affect mpg.

    Gotta kick em out.
     
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  17. Mar 13, 2019 at 9:41 AM
    #17
    Bmerr222

    Bmerr222 [OP] Member

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    4 inch lift,33/12.50r18, muffler delete,etc
    I haven’t had the truck very long haven’t done any maintenance other than oil change and filter every 3k, plugs, air filter change I can’t thing of anything else off the top of my head
     
  18. Mar 13, 2019 at 9:42 AM
    #18
    Bmerr222

    Bmerr222 [OP] Member

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    4 inch lift,33/12.50r18, muffler delete,etc
    100k 4x4 trd off-road package
     
  19. Mar 13, 2019 at 9:43 AM
    #19
    Bmerr222

    Bmerr222 [OP] Member

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    4 inch lift,33/12.50r18, muffler delete,etc
    Truck feels like it’s dragging more than it should also even with the lift and tires
     
  20. Mar 13, 2019 at 9:44 AM
    #20
    Sterling_vH111

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    I’d make sure your spark plugs are gapped correctly, just changing them to new ones may not help, or possibly make it worse if the gap is way off.
    I forget what the 1gr calls for as far as the spec though.

    My next guess would be one or two of the cats, and/or o2 sensors. Any of those gone bad can cause terrible mpg.

    The heaviest influence though is the right pedal, that said, 7mpg is worse than usual. I got 10mph while towing 4000lbs and have 4+” of lift and 33’s. I usually get around 14 mixed unloaded.

    Also, make sure you are compensating for your larger tires. Ie: 33’s are about 6% taller than oem tires. Let’s say you go 250miles on a tank of gas, 18 gallons used. [250+(250*6%)] / 18 will be your tire mpg.
     

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