1. Attachments are working again! Check out this thread for more details and to report any other bugs.

PRIUS calculation of MPG

Discussion in 'Gen 2 Prius Technical Discussion' started by tjs4689, Aug 12, 2006.

  1. tjs4689

    tjs4689 Junior Member

    Joined:
    Jul 27, 2006
    10
    0
    5
    Location:
    Pafici Northwest
    Vehicle:
    2009 Prius
    Model:
    V
    How does the PRIUS calculate MPG and to what level of precision?
    For Example does PRIUS calculation 4 to the left and 4 to the right (1234.4321) an only Display Two to the left and one to the right (99.9)? Or is it using something else?
    If true then the user will be forced to the more accurate calculation outside of the PRIUS system as they would never see any better than 99.9 MPG.
     
    #1 tjs4689, Aug 12, 2006
  2. qbee42

    qbee42 My other car is a boat

    Joined:
    Mar 2, 2006
    18,058
    3,075
    7
    Location:
    Northern Michigan
    Vehicle:
    2006 Prius
    <div class='quotetop'>QUOTE(Timothy J. Suhr @ Aug 12 2006, 09:40 AM) [snapback]302085[/snapback]</div>
    The computer uses more digits in its internal calculation.

    Tom
     
    #2 qbee42, Aug 12, 2006
  3. eagle33199

    eagle33199 Platinum Member

    Joined:
    Mar 2, 2006
    5,122
    268
    0
    Location:
    Minnesota
    Vehicle:
    2015 Prius v wagon
    Model:
    Two
    The computer does use more calculations, but most users have found that those are usually off by a few MPG, when compared to hand calculations (taking the number of miles divided by the amount of gas you put in at the end of those miles). While some of this undoubtedly has to do with the bladder system making refills so unreliable, people have found that, over several years their calculations are, on average still a few MPG different than the car's, which pretty much indicates that the car's calculations are ever so slightly off. (meaning that, comparing the car's calculations with total miles to arrive at gallons, you'd be either over or under by more than 10 gallons)
     
    #3 eagle33199, Aug 14, 2006
  4. DanMan32

    DanMan32 Senior Member

    Joined:
    Aug 27, 2004
    3,799
    27
    0
    Location:
    Tampa Bay, FL
    My MPG is 1.6MPG optimistic over a 63K lifetime.
     
    #4 DanMan32, Aug 21, 2006
(You must log in or sign up to post here.)