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2008, What Else Can Be Done to Improve Fuel Economy?

Discussion in 'Gen 2 Prius Fuel Economy' started by Ozzbo, Aug 25, 2023.

  1. Ozzbo

    Ozzbo New Member

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    Gen 2 2008. Changed spark plugs, air filter, cleaned MAF and throttle body. The cat had been stolen, then a replacement was installed. Mileage is 148,000 miles. Before and after the cat was stolen, the mpg was 45-48. One day after Costco gas filling the mpg dropped to 41-42. Tires are 40 psi. Driving is very gas saving. No acceleration. What else can be done to improve mpg? Thanks.
     
    #1 Ozzbo, Aug 25, 2023
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  2. dolj

    dolj Senior Member

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    You need to give it time. I never take much notice of the MFD figure until there are 200-300 miles on the tank. I only compare MPG for full tanks with each other.
     
    #2 dolj, Aug 26, 2023
    Last edited by a moderator: Aug 31, 2023
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  3. Ozzbo

    Ozzbo New Member

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    Should I clean the battery fan? Can that help with increasing mpg?
     
    #3 Ozzbo, Aug 29, 2023
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  4. bisco

    bisco cookie crumbler

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    absolutely, if it's dirty

    air filter?
     
    #4 bisco, Aug 29, 2023
    Last edited by a moderator: Aug 31, 2023
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  5. Ozzbo

    Ozzbo New Member

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    Yes sir, changed!
     
    #5 Ozzbo, Aug 29, 2023
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  6. Ozzbo

    Ozzbo New Member

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    One day, a Check engine light came up. After 2 days it disappeared. Recently I read the errors with Torque Pro app, and it showed the P0101 error (MAF sensor). I cleaned the MAF again and reset the error. I will update on the consumption later. At the moment I have almost 400 miles run with 2 units of fuel rest. Hopefully, I will make 500 miles.
     
    #6 Ozzbo, Sep 2, 2023
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  7. Ozzbo

    Ozzbo New Member

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    I had a long trip about 500 miles. MPG has grown from 42.3 to 45.5. The speed was in a range 60-70 mph.
     
    #7 Ozzbo, Sep 10, 2023
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  8. Classic Car Guy

    Classic Car Guy Active Member

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    My 2007 had a big reaction to 45-47 mpg after the replacement of the stolen cat. It didn't took long and after a year it went back to 40-43. Mine does more mpg in the hway than street. I don't know why? By the way I'm using a bigger tire instead of the original 185. I still have the original tires brand new and I tried it one time during winter. I cant stand the ride. I don't know why?
    Been like that since when I bought it 98k miles. Now is 151k. I consider the car running very good to excellent. The tire wear in my car is not even 50%. I can easily do a decent 25k as long as I don't get screwed with a big nail.


    Bridgestone Ecopia ep422 plus 195x65x15.JPG
     
    #8 Classic Car Guy, Sep 11, 2023
  9. Ozzbo

    Ozzbo New Member

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    After couple days of accurate city driving, I got 46.5 mpg which looks normal to me.
     
    #8 Ozzbo, Sep 15, 2023
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  10. Ozzbo

    Ozzbo New Member

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    After replacing the MAF sensor, MPG gradually reached 55-56. Before, there was an occasional Check engine light pointing towards the MAF sensor.
     
    #8 Ozzbo, Nov 21, 2023
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