Don't know if I should be excited or upset!

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by Paul58, Aug 19, 2010.

  1. Paul58

    Paul58 Mileage Miser

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    Got home this afternoon and was so excited and proud of the fantastic 58.5 mpg displayed on the dash! After reading the posts here about tire pressure I figured I'd see where mine were at and maybe tweak them a little to squeeze a bit more out of a gallon of gas. You can imagine my surprise when I found the tire pressures ranging from 27.5 PSI to 31 PSI! My Prius is only two weeks old, and I've only put 300 miles on it so far, but I was shocked the dealer didn't check and adjust the tire pressure before delivering the car.

    So, I made my adjustments: 40 PSI in the front and 36 PSI in the rear, and hopefully will be able to improve upon the current 58 mpg I'm enjoying.

    Now, a question for the Chemical Engineers in the crowd... My Dealer Window Sticker showed I had the dealer installed option of Nitrogen in my tires (along with a couple BS applications). I added good ole Southern Georgia air! Will there be any ill effects by mixing Nitrogen and Atlanta air (with all it's various polluted particulates)?
     
    #1 Paul58, Aug 19, 2010
  2. JimboPalmer

    JimboPalmer Tsar of all the Rushers

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    Air is 78% Nitrogen already, they will mix fine.
     
    #2 JimboPalmer, Aug 19, 2010
  3. Paul58

    Paul58 Mileage Miser

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    I knew I could count on someone to put my mind at ease! Thanks...
     
    #3 Paul58, Aug 19, 2010
  4. almypal26

    almypal26 Member

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    As long as you stay child at heart.:D
     
    #4 almypal26, Aug 19, 2010
  5. bagwell

    bagwell Active Member

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    had my car a week and set all tires to 40psi = 60.5mpg on my 52 mile RT commute...average speed approx 50mph
     
    #5 bagwell, Aug 19, 2010
  6. Paul58

    Paul58 Mileage Miser

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    Ahh so there's still hope!

    So, what is the Executive Package?
     
    #6 Paul58, Aug 19, 2010
  7. cit1991

    cit1991 New Member

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    ChE here. Air is fine. They use nitrogen in aircraft tires to save a few pounds (mass not psi). Aircraft tires contain much more gas, and a few pounds of weight savings is worth it.

    The overwhelmingly important thing is to keep them at the right pressures.

    The only precaution I take is to add air only when the compressor tank is cool (not right after running the compressor to pressure it up). That way, I add less water vapor.

    Also, when you do top them up, don't forget to reset the TPMS, so it can do its job.
     
    #7 cit1991, Aug 20, 2010
    1 person likes this.
  8. 2009Prius

    2009Prius A Wimpy DIYer

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    Would love to see a photo or scan of the sticker. Thanks! :)
     
    #8 2009Prius, Aug 23, 2010
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