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K & N Filter Performance question

Discussion in 'Performance and Tuning' started by Shawman20, Feb 6, 2011.

  1. Feb 6, 2011 at 6:12 PM
    #1
    Shawman20

    Shawman20 [OP] Member

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    I installed a direct replacement k & n filter on my taco, and the first 2 tanks of fuel with the filter installed have been the worst mpg since I have had the truck. Has anyone else experienced a loss of performance with the k & n filter over the stock filter?
     
  2. Feb 6, 2011 at 6:15 PM
    #2
    JDMcQ

    JDMcQ Well-Known Member

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    The tests that I have read indicate that the gain from an aftermarket filter is negligible at typical engine speeds, on top of that, they do not filter as well as the stock type paper filter.
     
  3. Feb 6, 2011 at 7:40 PM
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    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

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  4. Feb 6, 2011 at 8:24 PM
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    Chris(NJ)

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  5. Feb 6, 2011 at 8:38 PM
    #5
    Mod

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  6. Feb 6, 2011 at 8:40 PM
    #6
    Sproulesxrunner

    Sproulesxrunner Well-Known Member

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    I personally never noticed any gain in MPG or HP. I don't think I lost any MPGs however.What is your definition of "worst miles per gallon"? How drastic of decrease are you talking about?
     
  7. Feb 8, 2011 at 5:00 PM
    #7
    Shawman20

    Shawman20 [OP] Member

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    I was getting around 15 mpg around town and the last 2 tanks were both 13.7 mpg. I would consider that a significant decrease. I haven't had a chance to do a highway mileage tank with the filter in yet.
     
  8. Feb 9, 2011 at 1:37 PM
    #8
    Yamaha Dave

    Yamaha Dave Well-Known Member

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    Actually this is normal and will happen with any high flow filter until the ECU can recalibrate itself after a few hundred miles. What I'd recommend is you disconnect the battery, pump the brake pedal for 15 seconds, leave the battery disconnected for 15 mins. Reconnect and put a few hundred miles on it.
     
  9. Mar 5, 2011 at 10:04 PM
    #9
    Copacetic

    Copacetic New Member

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    Before I put on my K&N CAI I was getting about 18.0-18.7. After I put it on my first tank averaged out to 17.9, but I do admit to driving it harder right after I put it on. After I started driving normally my MPG is staying around 18.4 to 19.3. Oh and its an 07 access cab V6.
     
  10. Mar 5, 2011 at 10:09 PM
    #10
    bowhunter11199

    bowhunter11199 Well-Known Member

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    well in my case i dont know if i got any better mpg cuz few things are electric(98 taco) put i thought i could feel a little gain in power. but i didn't just buy their filter i did the whole cold air intake.
     
  11. Mar 6, 2011 at 5:59 AM
    #11
    Janster

    Janster Old & Forgetful

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    I ran with K&N and open deckplate for years on my 1st gen - and I gained about 2mpg.

    Currently, I have an AFE on the 07 and other similar upgrades that I had on the 1st gen.....and I haven't seen any improvements. These 2nd gen trucks just don't respond to normal 'mpg' type upgrades. My 1st gen truck never had a decrease of MPG in the winter at all. These 2nd gen trucks don't like the winter gas or the cold temperatures.
     
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