1. Attachments are working again! Check out this thread for more details and to report any other bugs.

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

    Joined:
    Oct 14, 2023
    12
    3
    0
    Location:
    remote
    Vehicle:
    2007 Prius
    Model:
    Touring
    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

    Joined:
    Oct 25, 2023
    49
    17
    0
    Location:
    New Zealand
    Vehicle:
    2007 Prius
    Model:
    N/A
    I found the same thing on my 2007, but I only changed the air filter.
     
    #2 Kiwi7910, Oct 25, 2023
  3. lexidium

    lexidium Active Member

    Joined:
    Nov 19, 2015
    245
    110
    0
    Location:
    manchester
    Vehicle:
    2008 Prius
    Model:
    N/A
    Strange. I've just changed the air filter and cleaned the MAF in my 2008 and if anything there's a slight drop! :(
     
    #3 lexidium, Nov 3, 2023
    bisco likes this.
  4. bisco

    bisco cookie crumbler

    Joined:
    May 11, 2005
    110,129
    50,045
    0
    Location:
    boston
    Vehicle:
    2012 Prius Plug-in
    Model:
    Plug-in Base
    i got nothing out of a new air filter, but the old one looked brand new
     
    #4 bisco, Nov 3, 2023
  5. haxsen

    haxsen New Member

    Joined:
    Oct 14, 2023
    12
    3
    0
    Location:
    remote
    Vehicle:
    2007 Prius
    Model:
    Touring
    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.
     
    #5 haxsen, Nov 14, 2023
  6. Classic_Prius

    Classic_Prius New Member

    Joined:
    Jan 1, 2024
    1
    0
    0
    Location:
    Virginia Beach
    Vehicle:
    2007 Prius
    Model:
    Touring
    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.
     
    #6 Classic_Prius, Jan 1, 2024
  7. bisco

    bisco cookie crumbler

    Joined:
    May 11, 2005
    110,129
    50,045
    0
    Location:
    boston
    Vehicle:
    2012 Prius Plug-in
    Model:
    Plug-in Base
    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
     
    #7 bisco, Jan 1, 2024
  8. Brian1954

    Brian1954 Senior Member

    Joined:
    Jan 31, 2021
    1,105
    410
    0
    Location:
    South Central PA, USA
    Vehicle:
    2011 Prius
    Model:
    III
    It is normal for the gas mileage to decrease in the winter. It should go back up next summer.
     
    #8 Brian1954, Jan 1, 2024
  9. haxsen

    haxsen New Member

    Joined:
    Oct 14, 2023
    12
    3
    0
    Location:
    remote
    Vehicle:
    2007 Prius
    Model:
    Touring
    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.
     
    #9 haxsen, Jan 1, 2024
    bisco likes this.
  10. ebikeman

    ebikeman Junior Member

    Joined:
    Sep 23, 2023
    72
    10
    0
    Location:
    Northwest
    Vehicle:
    2007 Prius
    Model:
    Touring
    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
     
    #10 ebikeman, Jan 9, 2024
  11. AceDeuceCoupe

    AceDeuceCoupe Junior Member

    Joined:
    Nov 29, 2011
    35
    3
    0
    Location:
    LA
    Vehicle:
    2007 Prius
    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.
     
    #11 AceDeuceCoupe, Jan 22, 2024
  12. ebikeman

    ebikeman Junior Member

    Joined:
    Sep 23, 2023
    72
    10
    0
    Location:
    Northwest
    Vehicle:
    2007 Prius
    Model:
    Touring
    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
     
    #12 ebikeman, Feb 5, 2024
  13. Brian1954

    Brian1954 Senior Member

    Joined:
    Jan 31, 2021
    1,105
    410
    0
    Location:
    South Central PA, USA
    Vehicle:
    2011 Prius
    Model:
    III
    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.
     
    #13 Brian1954, Feb 5, 2024
(You must log in or sign up to post here.)