Speedo check

[CROSSBOLT]

Probably been done and may be old news BUT did a speedometer accuracy check with a hand-held GPS. It was virtually "dead nuts" for two speeds of 45 and 55 mph with its excellent cruise on level ground, daylight, ambient 42°F, wind light and variable.

[skyblue]

Lucky you, mine is 8km/h out and my last car was similarly bad. Cars over here can read 10% over actual speed before being rejected by quality assurance.

[CROSSBOLT]

Lucky you, mine is 8km/h out and my last car was similarly bad. Cars over here can read 10% over actual speed before being rejected by quality assurance.

That 10% fast indication was the US "standard" for many years so it seemed. Always wondered why they could not seem to achieve more accuracy.

[Eggman]

Maybe the accuracy you are reading is due to your tire size? Mirage tire sizes are taller these days.

[mohammad]

last time i tried to check with 185/65/14 tires on stock rims my gps said my speedo was dead on, but those tires are 5% larger in diameter so dunno.