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a_cycle_addict t1_j6jxyod wrote

Waze has one built into phone gps. It's dead on accurate.


stickynohte t1_j6jzw4z wrote

Mine is always off by 1mph, but close enough!


a_cycle_addict t1_j6k8xhz wrote

Or is your car off by 1mph??


stickynohte t1_j6khbwo wrote

When I pass the speed limit signs (that I believe OP is referring to) they’re accurate to what my car is clocking. BUT maybe car + signs are wrong and waze is the correct one. The world will never know.


Hiltson87 t1_j6ksz3z wrote

It's just dumb luck if you're exactly calibrated because tires can vary in actual size vs the numbered size. More common in lifted trucks, but the bigger the tire the more your speedometer will be off and most people don't bother to change their speedometer gear to match the new tire size. It's not unusual for a regular car to be off by 1-2 mph though.