What's the worse factory calibrated speedo you've come across?

[OzJavelin]

For me it's consistently been Mitsubishi's .. any of them.
Rentals, work fleet cars, my mothers Lancer, my wifes Triton .. all of them have been way, way out.
For example, my wifes Triton as best I can tell, you need to be doing at least 118km/h on the speedo to be anywhere near a real 110km/h road speed.
All the Falcons / Commodores I'd driven (stock) have always been almost dead-on accurate for speed.
Seems to be getting worse with newer vehicles.
I'm assuming people see inconsistencies between speedo's and built-in GPS systems?