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why did my mpg go down

Discussion in '2nd Gen. Tacomas (2005-2015)' started by 07txtaco, Sep 3, 2010.

  1. Sep 3, 2010 at 7:13 AM
    #1
    07txtaco

    07txtaco [OP] Member

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    Ok so i just switched from conventional oil to fully synthetic and my mpg dropped from 16.5 to 14. my miliage is at 40000 and i bought the truck at 36k so im thinking i need a tuneup but why such a big drop in mpg. also i read somewhere that pure acetone could help with mpg by up to 20% any thoughts.
     
  2. Sep 3, 2010 at 7:20 AM
    #2
    98tacoma27

    98tacoma27 is gooder 'en chicken Moderator

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    If pure acetone helped that much, everyone would be running it, like TB spacers or Fitch Fuel catalysts or Hydrogen generators......... Second, it would probably destroy the emissions components.

    Do a basic tune up; plugs, clean the MAF, air filter, yada yada yada. Then see what the MPG is.

    Just changing from dyno to synthetic is going to give you a noticable or significant increase anyway.
     
  3. Sep 3, 2010 at 7:21 AM
    #3
    Toyota Truck

    Toyota Truck Well-Known Member

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    That's weird if any thing it's suppose to improve MPG. Did you add any weight to the truck? Did you start driving faster? Did you use a heavier weight of oil? I thought about the acetone thing but instead I drive slower.
     
  4. Sep 3, 2010 at 7:25 AM
    #4
    TanSR5x4

    TanSR5x4 Hold my beer and watch this

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    maybe its opposite day?
     
  5. Sep 3, 2010 at 7:27 AM
    #5
    07txtaco

    07txtaco [OP] Member

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    nope stayed at 5w 30. driving habits are the same. i wonder why i get crappy mpg though. i would be happy if i could just average 17
     
  6. Sep 3, 2010 at 7:28 AM
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    Toyota Truck

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    :laugh:
     
  7. Sep 3, 2010 at 7:33 AM
    #7
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

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    Change the plugs. If the records dont indicate it was done at 30K, you need them changed.
     
  8. Sep 3, 2010 at 7:34 AM
    #8
    OH-MAN

    OH-MAN Well-Known Member

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    Acetone?
    Does it go in the oil or in the gas???

    I have never heard of this, kind of scary to me.
     
  9. Sep 3, 2010 at 7:41 AM
    #9
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

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    It used to be used in Supercharged, or turbo'ed aplications mostly. Then, People became aware that its not a good idea, and started doing it the right way, and adding more fuel.
     
  10. Sep 3, 2010 at 7:42 AM
    #10
    07txtaco

    07txtaco [OP] Member

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    it goes into the gas. from what ive read it said 2 oz for every 10 gallons of gas.. ok so besides the plugs should i change the wires as well or no. never really done a full tune up but i know how to change spark plugs
     
  11. Sep 3, 2010 at 7:43 AM
    #11
    Masada

    Masada Well-Known Member

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    DO NOT USE ACETONE IN YOUR FUEL!

    lol there's so much bad info out there on ways to improve MPG. I would go to your local parts store and get some lucas fuel treatment and dump that in there on your next fill up. I did it and it helped get me back up to 17mpg average.
     
  12. Sep 3, 2010 at 7:43 AM
    #12
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

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    Just the plugs. Gap them at .041. First, Find out if they were even changed. If there is no doccumentation, pull a driver side plug. If its an NGK, more than likely, they havent been changed.
     
  13. Sep 3, 2010 at 7:50 AM
    #13
    07txtaco

    07txtaco [OP] Member

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    ok lets say i change them for the hell of it what would be the best spark plug for better mpg. also is there a way to get into the computer with my scan gauge and mess with the engine so its at a lower rpm. right now at idel im at like 700
     
  14. Sep 3, 2010 at 7:50 AM
    #14
    Masada

    Masada Well-Known Member

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  15. Sep 3, 2010 at 7:52 AM
    #15
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

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    OEM Denso's give the best performance. No...You cant hack into the ECU to change the engine peramiters..
     
  16. Sep 3, 2010 at 8:00 AM
    #16
    07txtaco

    07txtaco [OP] Member

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    ok so besides the plugs any other ideas. my k&n still looks cleans i oiled it up last oil change.3k miles ago
     
  17. Sep 3, 2010 at 8:05 AM
    #17
    Jigzor

    Jigzor Well-Known Member

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    Clean your MAF sensor.
     
  18. Sep 3, 2010 at 8:05 AM
    #18
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

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    Clean your MAF, and dump the K&N filter for an OEM.
     
  19. Sep 3, 2010 at 8:08 AM
    #19
    OH-MAN

    OH-MAN Well-Known Member

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    Do the plugs, Make sure you did not over oil the K&N.
    As Chris said do not mess with the engine control computer stuff.

    There is no wonder MPG trick. If you check air pressure in tires to keep them up to proper anounts, control your foot, let off sooner as you approach stop signs and lights, run 65 instead of 75 on the freeways.
    Carry no more weight in the truck than you need and hope for a tail wind.

    Thats about it.
     
  20. Sep 3, 2010 at 8:13 AM
    #20
    07txtaco

    07txtaco [OP] Member

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    thanks people hope yall have a great labor day weekend off to the part store.
     
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