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 ...

DETROIT — The speedometer on the Toyota Yaris says the tiny car can go 140 mph. In reality, the bulbous subcompact's 106-horsepower engine and automatic transmission can't push it any faster than 109.

The 2005 Bugatti Veyron did more than nudge the speedometer a little higher. It shattered a psychological and engineering ...