Did you get this figured out?Good day folks!
I recently bought a 2013 G550 w/33" tires (285/75-16). While I do not have ESP issue, my speedometer is off by 3-5 miles depending on speed (it shows lower speed on speedo than what actual speed is). Contacting dealership was not of any help as they sighted 'federal regulations' and would not touch speedometer/transmission calibration. Couple of specialty stores gave me the same song-n-dance.
There have been colorful discussion on pointedthree but I am not following as to which parameter needs to be set to what values.
I am located in metro DC and any assistance on this front will be greatly appreciated (have 'wheels' and will travel!!). Thanking you kindly!