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Seems to only affect weight/steering effort. I'd hoped it affects steering ratio but it is fixed.
So I use comfort. Why work harder for the same results
from this articleCombined with a variable-ratio steering rack that has three selectable levels of resistance,
sport requires less turning of the steering wheel to make the same arc as standard or comfort. I like that efficiency. Wife changed the setting to standard once and didn't change it back. The reduced responsiveness was immediately apparent to me. I thought at first there was something wrong with the car. then I checked the setting and put it back to sport. all is right again.
Standard for me on the 3, husband uses comfort. In S & X, I use sport.