Originally Posted by SgtGoldy

I don't correct people that say 6.3 because then they wanna know why and then I have to explain. I did it when I first got the car, now its just easier to go with it lol. hers a copypaste:

Press release first mentions 6.3-liter V8 engine and then later states 6208 cc. To comply with German law, Mercedes-Benz is required to round up the displacement figure to 6.3 when used for marketing purposes. Germany charges per liter so I'm assuming that law helps rake in a little extra.

from the link I have in my original post they will have it:

"275/40 ZR20 106 (Y) XL"