Speedometer displays slower than car

[Sahirsiddiqui]

My experience is that both Waze (& my old Garmin GPS) show speeds almost exactly 10km/hr slower than my actual speed.

[dmcconachie]

My experience is that both Waze (& my old Garmin GPS) show speeds almost exactly 10km/hr slower than my actual speed.

"Actual" measured by? If your car then this is normal and waze will actually be closer to your actual speed.

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[BlazeTool]

If you want to know your "actual" speed, take your car to a mechanic that will calibrate and certify the speed. (In the States, AAA will certify speedometers).

Slight changes in tire size can make a significant change in speedometer readings.

[xteejx]

Also, speedometers are 10% too fast by design. This includes digital displays.

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[simonhowes]

My little Mazda MX5 Miata and two Ford Focus speedo shows 70mph but Waze and my Garmin satnav show 63-65mph. I have tried holding an anemometer out of the window and Waze was correct. Cars are normally given -10% tolerance at max, also switching wheels and tires to different sizes can have an effect if the circumference is different. My friends Range Rover and Audi R8 match Waze perfectly.

iOS isn't accurate. You can only poll for a location once every 15 seconds plus it also use AGPS, DGPS would be the best way to get accurate readings.

[AlanOfTheBerg]

In the 25-40 range, Waze and my Fusion align nearly perfectly, taking into account slight variations due to instantaneous changes on accel/decel.