From my GPS unit and from those road sign that indicate your current speed as you approach construction zones etc it appears my speedo is high by around 7-10kmh...and that is with 235/75R15 Duratracs that are a little bigger than stock tire size. I guess I am not actually rocketing through the hills as fast as I thought lol (still faster than my Surf regardless)...but on the bright side it is a great reason to get a lift and 31's sooner than later to correct that gauge reading.

I haven't verified my odometer with the GPS yet but I hope it isn't also ~10% high. That would mean my fuel ecconomy is worse than calculated. I have been getting fuel ecconomy of around 12.9-13.5L/100kmh which is fine but if the odo is 10% off that shifts to 14-15L/100km which is kind of on the high side of the reported fuel ecconomy ranges here...boo.