Which is more accurate?

[mighty_chick]

actually speedometeres are jknown to be wrong on almsot all cars they are off until you get them properly calibrated. the GPS i would say is working correctly while teh car is probably not working correctly

 

[David Lindon]

What car do you have to do 130 in?

I would say the one in the car

 

[semtex]

it's an audi A4 2.0FSi, and the 130mph was on the A3 in surrey - quite a good road for it as visibility is excellent, ie see it's clear, and nail the throttle. found out today the same thing happens in my friend's Honda CRX too. The Audi's speedo is electronically crontrolled, while the CRX's is cable driven.