See mines spot on in the D22 with 265/70-R16's
My last GQ was spot on with 33x12.5's but they were worn when i got them
D21 was reading 10% over with 32x11.5's on
GQ wagon before that was reading about 3% over with 33x12.5's (when fitted brand new)
I'm trekking 42km to work and back each day and i pass a lot of cameras so i wanted to maintain the correct speed on the dial, not sure if people changed the speedo cable drive in the gearbox or they got a speedo correction box (to alter the electronic signal?) or they went and had the thing recalibrated.
I'm aware of the other ways to read speed, thats how i checked each speedo, just wanted to know who has done it, if anyone.