For smooth, quiet performance --- at a bargain price --- you really can't beat the V12's.

The only other tire that competes according to the surveys (smooth, quiet performance) would be the Continental Extreme Contact DW's, but for several hundred dollars more. Personally, cost aside, I prefer the Hankook tread pattern.

I'm up for new rubber myself, so going with the V12's is a no-brainer. Where do I sign?

BTW: The ideal and largest size tires for the XF are 235/40R18 and 275/35R19.