Modern cars surround drivers with digital certainty, yet one of the most basic numbers on the dashboard is quietly biased in your favor. The speedometer is designed to err on the side of reading high, ...

The average car speedometer may be off by a few mph There are several GPS and 3rd party apps that show your actual speed The speedometer, of course, tells you how fast or slow your car is moving when ...

Drivers have been warned the reading on their speedomoters may be FALSE - putting them at risk of huge fines. Haynes, a car maintenance firm, said: "Your car's speedometer rarely tells the truth. If ...