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Gas mileage better with full tank!

Discussion in 'Gen 3 Prius Fuel Economy' started by Rickkiboi, May 4, 2023.

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  1. Rickkiboi

    Rickkiboi Junior Member

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    I have a 3rd Gen , 217k miles (9k on rebuild), original hybrid batt that’s tests fine, running 215/45/17s.

    I get relatively good gas mileage on a full tank, about 52mpg. However after about 40 miles of driving, gas mileage drops down to 39mpg.

    This started before the rebuild around 207k miles.

    Any thoughts?
     
    #1 Rickkiboi, May 4, 2023
  2. Mendel Leisk

    Mendel Leisk EGR Fanatic

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    What was the rebuild about?
     
    #2 Mendel Leisk, May 4, 2023
  3. Bill Norton

    Bill Norton Senior Member

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    Who cares what that display says.
    The real deal is what a paper and pencil says at fill ups.
     
    #3 Bill Norton, May 4, 2023
    ukulelegeek likes this.
  4. bisco

    bisco cookie crumbler

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    it could be that when the tank is full, the pump struggles to push enough fuel, but once a little gasoline is replaced with air, better suction is accomplished
     
    #4 bisco, May 4, 2023
  5. Grit

    Grit Senior Member

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    I full tank on uphill driving and it get horrible mpgs. Half tank on the way back gets me twice the mpgs. Not sure why but I got the opposite result from yours
     
    #5 Grit, May 4, 2023
    Bill Norton likes this.
  6. Bill Norton

    Bill Norton Senior Member

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    Just to point out the obvious, you have a Level 5. I have one also, but those wheels and tires are never going to get you
    'Typical Prius fuel economy'.

    That's why I sold my 17" wheel set and now use standard 15" wheels and tires.
    I immediately saw a decent improvement! And the ride is quieter and less 'jarring'.
    It's weird how the Level 5's didn't have their own EPA numbers. They were definitely less efficient.
     
    #6 Bill Norton, May 5, 2023
  7. Bill Norton

    Bill Norton Senior Member

    Joined:
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    Vehicle:
    2010 Prius
    Model:
    Five
    Just to point out the obvious, you have a Level 5. I have one also, but those 17" wheels and tires are never going to get you
    'Typical Prius fuel economy'.
    They look nice and the handling is quicker/better! I believe it also has a quicker ratio steering rack.

    That's why I sold my 17" wheel set and now use standard 15" wheels and tires.
    I immediately saw a decent improvement! And the ride is quieter and less 'jarring'.
    It's weird how the Level 5's didn't have their own EPA numbers. They were definitely less efficient.
     
    #7 Bill Norton, May 5, 2023
    ukulelegeek likes this.
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