Speedometer discrepancy

[alexm]

Anyone else noticed the speed indicated is +2/+3 mph over than it seems to be. Two things I compared is GPS based speed in Google maps (that I know is very inaccurate but at the cruising speed it mostly matches on other cars I drive) and speed warning posts where it will display your speed to you with a warning to slow down. I double checked the wheel sizes in settings and it matches what's installed.

 

[segbrk]

There are many threads on this. It should show almost exactly 2mph over real speed. Most if not all modern cars do this, silly liability reasons.

 

[MoniputerLM]

Anyone else noticed the speed indicated is +2/+3 mph over than it seems to be. Two things I compared is GPS based speed in Google maps (that I know is very inaccurate but at the cruising speed it mostly matches on other cars I drive) and speed warning posts where it will display your speed to you with a warning to slow down. I double checked the wheel sizes in settings and it matches what's installed.

Yes, my Air DE has always showed 2-3 over.

 

[7OaksTom]

I always set cruise control for 2 mph over my desired speed. The Google Maps GPS reading is always right at the speed I actually want to be going.