Speedometer accuracy

[ancster]

During my drive today, I was using a GPS. The speedometer was consistently reading 8-10% higher than the GPS.
Is there a way to have the speedometer adjusted/calibrated to provide accurate readings?

[Paul]

These cars usually read a constant 3 to 4 mph faster than actual. The odometers are usually correct.

Others have reported the dealer can reduce the error somewhat, most of us just drive 10 over.

[rick3000]

My GPS is normally reading 2-3 MPH below my speedometer. It depends, on the car, most of the speedo's are off a little, but it shouldn't affect the odometer. If you ever upgrade rims sized or something of that sort, that could cause it be off. The dealer might be able to help you calibrate it. I just go with the flow, and avoid being the fastest on the road (unless no one is around) and the exact speed doesn't really matter.

i hear the dealer can change it because its electronically controlled. In my car I can see the real speed (in KM/hr) using the climate controll special function.

My GPS says it is off (fast) by 2 MPH in most speed ranges. Same thing for my Ford Explorer.

[Chills]

According to my GPS and the radar/speed signs by the side of the freeway my car's spedometer is about 4 mph over my actual speed.

[timothy]

Originally Posted by Paul

most of us just drive 10 over.

Very true but for most of us that doesn't have anything to do with speedometer accuracy.