The difference between actual speed and the speed dial tends to get noticed more with German cars because their speedometers are designed to never report a speed lower than actual speed. But, generally, most speedometers exaggerate speeds , says Wall Street Journal columnist Jonathan Welsh.
Anything that changes wheel diameter — such as putting on bigger tires — will affect the accuracy the odometer. The odometer, which directly reflects what the sensors are recording, doesn't have the same built-in inaccuracy as the speedometer. If your speedometer is off, it doesn't necessarily follow that the odometer is inaccurate too. A difference between the speed on your GPS and the speed displayed on your car's speedometer is normal, and it doesn't mean that your odometer is out of whack.
Bottom line: Off the lot with the manufacturer-installed tires like your leased VW Golf , there's a good chance that your speedometer is inaccurate, on purpose. Often cars displays a speed faster than your car is really going. This is pronounced in European cars which calibrate speedometers so they never show a speed slower than you're traveling, regardless of tire inflation and tire size.
The odometer leaves the factory calibrated to display accurate mileage, manufacturers say. That said, make any significant changes to tire size, and both the speedometer and the odometer will be inaccurate. Correction: Transport Canada says there are no federal regulations in North America regarding the accuracy of speedometers.
Because speedometers and odometers are calibrated to the diameter of the original tires, Transport Canada spokesperson Maryse Durette says, "if the owner departs significantly from the manufacturer's original specifications at the time of purchasing replacement tires, the speedometer will no longer be in calibration. Webinar series Educational videos Helpful articles Supporting resources Where to find help. Make a payment Renew your roadside Upgrade your roadside Update your details.
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