MPG Issue

Discussion in 'Gen 3 Prius Fuel Economy' started by Markee, Jul 4, 2015.

  1. Markee

    Markee Member

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    I owned a 2010 III with around 50k miles on it for about a year.

    I recently traded up the 2010 III for a 2013 level 4 with like 15k miles on it and right away I'm noticing something is just not right.

    I always fill the tank and I would always got just under 400 miles on a tank full with the 2010 III but for some unknown reason the 2013 level 4 is only getting me 310 maybe 320 at the very most

    So i went ahead did an oil change with Mobil 1 Synthetic 0W-20 Advanced Fuel Economy
    rotated the tires and set the psi to 36 all around the car has Ecopia EP20 on it
    If i recall correctly the 2010 had those OEM Goodyear Eco on it

    Anyways that didn't help at all in-fact my last take was the worst one yet got me only like 290 miles to the tank full ?

    So just started using that Fuelly and its saying my
    Avg MPG is 30.2 ?

    What could it be any opinions suggestions ?



    I drive and drove both vehicles identically the same used for business purposes with 95% city driving
     
    #1 Markee, Jul 4, 2015
    Last edited: Jul 5, 2015
  2. bisco

    bisco cookie crumbler

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    did i read that they reduced the tank size in the '13-4? how manny litres are you refilling?
     
  3. bwilson4web

    bwilson4web i3 and Prime

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    The Toyota web site still lists it at 11.9 gallons.

    Bob Wilson
     
  4. bisco

    bisco cookie crumbler

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    hmm, maybe someone put a brick in during assembly.
     
  5. Markee

    Markee Member

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    Bump this back up still looking for some experienced advice ?
     
  6. bisco

    bisco cookie crumbler

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    there are so many possibilities, where to begin? what do you know about the vehicles history?
     
  7. KennyGS

    KennyGS Senior Member

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    Have you actually verified your mileage by recording the miles driven over a few tank fillups? Miles driven divided by gallons pumped. Use the same pump every time. This will give you the most accurate measurement.

    Once you're sure the car's mileage is unusually low, then I would contact someone who can run a diagnostic to see if any codes come up that indicate where the issue might be.
     
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  8. bisco

    bisco cookie crumbler

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    and stop at the first click every time.
     
  9. Markee

    Markee Member

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    This is the vehicles history I also have the Carfax nothing unusual I can see that would affect the mileage ?

    History.JPG
     
  10. bisco

    bisco cookie crumbler

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    okay, you should test the 12 volt battery health, i just noticed the window tinting. did your mpg's drop, or was the first tank low?
     
  11. Markee

    Markee Member

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    Contact someone meaning bring it to the dealer?
    I have one of those OBDII adapters I used to turn off the reverse beeping is there some particular diagnostics i can run with that ?

    Is there a way to check the battery health with it ?
     
    #11 Markee, Jul 5, 2015
    Last edited: Jul 5, 2015
  12. Markee

    Markee Member

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    Na its been like that from the first tank i just tinted the front window the rest of the windows were already tinted
    anyway my previous Prius had the windows tinted pretty much exactly the same I don't get how that would affect the mileage ?

    Battery health the battery is draining and staying a bit on the low side been super hot here in South Florida and the A/C seems to be keeping the battery drained almost all the time its having trouble keeping charged
     
    #12 Markee, Jul 5, 2015
    Last edited: Jul 5, 2015
  13. bisco

    bisco cookie crumbler

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    btw, you're still under warranty.
     
  14. bisco

    bisco cookie crumbler

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    it's not the tinting, it's the fact that sometimes they leave the doors open and drain the battery.
     
  15. KennyGS

    KennyGS Senior Member

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    I would contact the dealer to find out what they're willing to do as far as reading for any codes and at what costs. Otherwise, a trusted mechanic that can read the codes who I know isn't just trying to get into my wallet would be better.
     
  16. bisco

    bisco cookie crumbler

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    have you tried resetting you trip meter, and seeing what it gives you on a good long ride under various conditions?
     
  17. Markee

    Markee Member

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    Yeah I know I'm under warranty Just hate going to the dealer

    Do you think this is a legitimate issue that dealer will take serious ?
     
  18. Markee

    Markee Member

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    I always completely fill the tank at the same gas state and always reset the trip meter on every fill up always
     
  19. cproaudio

    cproaudio Speedlock Overrider

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    I noticed that when the weather gets really hot, regen doesn't work even though the HSI shows it's full regenning. I know this because the battery amperage on my scan gauge stays at around -11 amps and my mechanical brakes shows that it's active. Normally regen braking shows -60 to -100 amps. Without regen, you'll get 10-25% less mpg.
     
  20. Markee

    Markee Member

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    Yeah i don't think thats the problem because my previous Prius was driving in the same heat and mpgs never got that bad plus i noticed right away the difference from the first gas tank on the new vehicle
     
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