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@SkylerH Gotcha on the quote formatting. Good point about 255/40R19 on 19x9" having a good selection, much better than 255/45R18.
Given the stuff we drive on I think 18" was the right choice for me and my wife, but if I ever get wider wheels+tires for this car I am leaning towards 19". Would still keep the 18" too for less aggressive tires.