Guys I have made an interesting find, usually due to Govt regulations speedometers overstate the speed by Four, Six and even Eight km/hr depending on the vehicle class. Could also be calibration problem. Anyways, I checked with Yaris Ativ X which showed 44km/hr (on Cruise control) but actual speed was 40km/hr (Google Earth) and with 2019 GLI the difference was 7-8km/hr. Slightly bigger tires will actually make the Speedometer more accurate
I request all to check/test Speedometer with Stock (185/60/R15) and specially those who have (185/65/R15), I have a feeling that Speedometer will be more accurate on these slightly bigger tires (185/65/R15). This also means the Speedometer average is slightly inflated as the car is actually travelling less distance per hour than shown on the speedometer.