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

Odometer and Speedometer Accuracy

Discussion in 'Prime Main Forum (2017-2022)' started by wyobob, Nov 26, 2021.

  1. Gokhan

    Gokhan Senior Member

    Joined:
    Oct 5, 2008
    4,194
    1,690
    0
    Location:
    Paramount CA
    Vehicle:
    2021 Prius Prime
    Model:
    Limited
    The speedometer bias is intentional. I measure it to be an exactly 2 mph constant bias between 30–55 mph according to roadside speed radars and not to be a percentage bias. It can also be measured with a GPS app on your smartphone. The car computer is probably not accurate.

    I did see the numbers for the intended bias in the OEM repair manual. 2 mph was about right. I don't remember the numbers exactly, but their range remains around 2 mph until very high speeds; then, it gets larger, about 4–5 mph or so at 90 mph as far as I can remember.