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Now that's interesting. I should be able to see the same using my OBD-II reader as well then.

LOL. I wish it was that simple. The wheel geometry changes percentage, not a fixed amount. 10% off means 200 indicated really is 180, 100 is really 90, 10 is really 9...etc as an example. I don't...

9% off? Wow.
hmm nice to know.
I thought the car all came with the same tires? Unless during winter, the dealer put on another winter brand, but they were all delivered by Nissan Canada with the...

:-/
What do the others see? 4% + ?

I managed to get a reading today. Found an available OPP officer and he seemed amused by my request, but obliged nonetheless.
So while my car indicated a steady 100 Km/h, his laser lidar showed 97...

I bought mine in Quebec, and came with winter tires (or tyres). Tiger paws of the same geometry.
But actual measure by GPS is higher than speedo is displaying. I'll see if I can get an OPP guy on a...

Funny that I find this thread. Last week-end I doing some survey for google maps and had my GPS gear on board, and noticed the speed was off by 6% too low. Speedometer showed 100 km/h, and ODB-II as...