New owner needs help...

Discussion in 'Gen 2 Prius Fuel Economy' started by powder brown, May 10, 2012.

  1. powder brown

    powder brown Junior Member

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    I just bought my car a week ago with a full tank and drove maybe 150 miles and right now I'm at half a tank! The monitor shows me avg 35.3mpg

    Here's the situation.
    1. I drive maybe 10-15 miles city driving round trip to work. With A/C constantly on at 72. It's been around 95 degrees outside.
    2. I don't know when the 12v battery has been changed. I figured before I spend $150 for the battery I wanna get some opinions first.
    3. The dealer just fixed a P1121 code and thought that maybe it could affect MPG.
    4. Maybe with the A/C on almost full blast at a stop light might keep the engine running more often which causes me to lose MPG.

    I'm just jealous hearing about everyone's MPG in the 40's and wanna know if its my driving habits or a battery change or something worse!

    Thanks in advance..
     
  2. JimboPalmer

    JimboPalmer Tsar of all the Rushers

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  3. powder brown

    powder brown Junior Member

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    ok i just did the self check battery procedure.

    12.2 - for normal unloaded battery
    11.7 - when i put a current load on the battery
    14.4 - when charging
     
  4. dianeinreno

    dianeinreno Member

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    I only get 42 mpg in my '07 Prius on average so we're not that far apart. If you are only driving 5 or 7 miles to work one way then the first 3 or 4 miles are likely going to get a LOT lower mileage as the Prius gets lower mpgs as it warms up so for a third to half of your commute your are getting much lower mpgs which will reduce the average overall. I'm saying that, under the circumstances, your mileage isn't really that far off.

    Take the car out for a hundred mile drive and watch your overall milage go back into the 40's. I think your battery is fine and the mileage that you are getting for the type of driving that you are doing is just about right.
     
  5. Rokeby

    Rokeby Member

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    Yup, the combination of a relatively short drive and the air cond. is
    a MPG killer. And your 12V battery is weakish, though not needing
    replacement just yet.

    Although typical 12V battery service life is ~4 years, lots of
    posts/threads point to service in long term high air temps like in
    AZ reduce that significantly.
    (Separate issue: this may also be true of the HV battery.)

    My daily commute on urban streets is 26 mi. round trip and with
    careful driving and a ScanGaugeII has produced 50.2 MPG over
    65K miles... but then I intentionally use heat/air cond. very little.
    That's twice you daily miles, but the extra miles are qith a fully
    warmed up engine/cat. converter... a big difference.

    What tires are you running...
    how old are they? ...
    at what pressure?

    Tires with <3K miles will reduce MPGs by ~3,
    MPGs are improved ~3 MPG at PSIs of 43 front/40 rear.
    (Don't worry, these are well below sidewall max pressures.)
     
  6. JimN

    JimN Let the games begin!

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    We have a similar problem in the winter when we have to run the defroster on a cold ICE to keep the windshield clear. 60mpg doesn't do you any good if you can't see.

    The other side of your situation is that if you are uncomfortably warm then probably so is your battery. Running the AC makes you & the battery feel better. Batteries are less efficient when very cold or very hot.

    What is your tire pressure? Increasing to max sidewall will help.

    Do you have LRR tires on the car?
     
  7. powder brown

    powder brown Junior Member

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    I haven't even checked the tires yet. I don't know the PSI nor the brand. Since i just bought the car i might as well do a tune-up, air/cabin filter, and an oil change.

    When it comes to normal maintenance like tune-ups, is it pretty much the same as any other car?
     
  8. JimboPalmer

    JimboPalmer Tsar of all the Rushers

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    Yes, very little maintenance to do.

    http://www.toyota.com/t3Portal/docu...MS0012/pdf/01omsour/2005/schedmai/51w1smt.pdf

    I do not know your mileage, so I can't give a page number.

    One item I would add, would be a Transaxle fluid change (about $100, if done by the dealer) with WS ATF. It is not in Toyota's schedule, but at 30,000 miles and then every 60,000 miles after that is a good idea to clear out metal bits before they short out the Motors. Expect the dealer to claim that it never needs changing, and just be firm that you want it done.
     
  9. powder brown

    powder brown Junior Member

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    82k miles
     
  10. JimboPalmer

    JimboPalmer Tsar of all the Rushers

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    PDF page 17, manual page 14

    then at 90,000 have the ATF changed, not just inspected.

    (I spent 14 years in Elko NV, I hope you like the state)
     
  11. powder brown

    powder brown Junior Member

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    Been in Vegas for 11 years now. Its hard getting use to the heat but other than those 4 dreadful months i love it here.
     
  12. JimboPalmer

    JimboPalmer Tsar of all the Rushers

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    Ah, I was on the '10 months of snow' end of the state, so MS is a change.
     
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