I have a 2015 MS, with 19" stock wheels I use for winter, and 21" turbines the rest of the year. And when switching, I do go into wheel settings and change them, to keep the mph accurate from tire rpm's.
Looking into getting 20" rims.
What do you all choose when you put aftermarket 20" rims on your car? As mine only gives me OEM options, none 20".
Do you just live with the inaccurate mph?