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Prius 07 fuel avg improved 21kmpl (50mpg) to 25kmpl (58mpg) by changing air filter and cleaning MAF

Discussion in 'Gen 2 Prius Fuel Economy' started by haxsen, Oct 22, 2023.

  1. haxsen

    haxsen New Member

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    Just wanted to drop it here.

    Cleaned MAF sensor using carbon cleaner (named Injection cleaner, spray).

    Attached: Previous air filter.
    I used Leppon's toyota air filter as replacement.
     

    Attached Files:

    #1 haxsen, Oct 22, 2023
    Last edited: Oct 22, 2023
    bisco likes this.
  2. Kiwi7910

    Kiwi7910 Junior Member

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    I found the same thing on my 2007, but I only changed the air filter.
     
  3. lexidium

    lexidium Active Member

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    Strange. I've just changed the air filter and cleaned the MAF in my 2008 and if anything there's a slight drop! :(
     
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  4. bisco

    bisco cookie crumbler

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    i got nothing out of a new air filter, but the old one looked brand new
     
  5. haxsen

    haxsen New Member

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    I have a new problem, my acceleration is terrible now, probably not related to this post. The RPM sounds high but car is struggling to gain speed. No DTC found on OBDII. MAF value is 0.6 g/sec on idle (engine off) and 1.9+ on idle (engine on) which goes up to 6 g/sec on 2500 rpm.
     
  6. Classic_Prius

    Classic_Prius New Member

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    What and w here is the MAF filter? Newbie. My 2007 with 78k miles has dropped to 36 mpg city...was over 40 for years.
     
  7. bisco

    bisco cookie crumbler

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    welcome!
    it isn't a maf filter, it's the engine air filter, and the Mass Airflow Sensor

    watch

    watch

    but there are many things that can affect mpg's
     
  8. Brian1954

    Brian1954 Active Member

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    It is normal for the gas mileage to decrease in the winter. It should go back up next summer.
     
  9. haxsen

    haxsen New Member

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    well, the things that affect mpgs are:
    1. Engine oil (5w 30 gives better but I use 10w 40 for engine safety as my car is 170k kms).
    2. Air filter.
    3. MAF condition.
    4. Oxygen sensor.
    5. HV Battery condition.
    6. Tyres condition and pressure.
    7. Throttle body and PCV condition.
    8. Make sure brakes are not constantly applied even slightly when you're not using the brake pedal.

    Other than these, the driving methods are a huge factor for mpgs.
     
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  10. ebikeman

    ebikeman Junior Member

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    Thank you for the video on the MAS. My car is all tuned up from the dealer and I get 32-37mpg (totally sucks that my full size huge boat 1998 Buick Park Avenue gets 30mpg on the highway and a little soda can hybrid gets 32-37).

    I will try and clean the MAS because it's so easy.

    Thank you,
    emb
     
  11. AceDeuceCoupe

    AceDeuceCoupe Junior Member

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    Any further info about number 8?
    Like how do I know or check this? I've had times when I kinda felt slightly like parking brake or something was on, maybe just ever so slightly, but the pedal is released fully..... But if your number 8 means that somehow the regular brakes could possibly be applying ever so slightly, then that might be it too. My coasting and even "warp stealth" are just not quite what they used to be.
     
  12. ebikeman

    ebikeman Junior Member

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    I'm wondering about this also. Why would Toyota put out a car specializing in gas mileage and design it to have the brakes on?

    What causes it?

    Thank you,
    ebm
     
  13. Brian1954

    Brian1954 Active Member

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    I think this is what he wanted to write:
    8. Make sure the brakes are not applied, even slightly, when you're not using the brake pedal.