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Speedo Calibration & Trim Level

Discussion in 'Gen 5 Prius Technical Discussion' started by PHEVGuy, Feb 17, 2024.

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Jim Call Active Member

Joined:

Mar 30, 2023

105

107

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Location:

Asheville

Vehicle:

2023 Prius

Model:

XLE

rjparker said: ↑

My Toyota speedometer reads high. BUT Toyota does have and use different speed calibrations for each factory tire size.

Now for the interesting part - the car’s ecus have very accurate speed - which you can access through the obd2 port.

Bottom line is Toyota wants you to stay under the speed limit and overstates the speed on the instrument panel. In my case by 3-4%.

As a result I monitor and alarm on the true speed and engine temp separately.

View attachment 251464

It is one reason why some people are annoyed by Prius drivers on the freeway. We may think we are doing the 65 mph speed limit but are actually driving closer to 62.
Click to expand...

Every manufacturer calibrates speedometers a minimum of 2% fast, at least in the US. Not sure about other countries.

#21 Jim Call, Mar 11, 2024

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