... because I just swapped my winter tires for my summer ones on my IS300.
There is a fair bit of tread left on the winter tires, so I can get at least one more season out of them (probably more like two or three).
It always amazes me how much it feels like getting a new car when I switch back to the high performance tires. The Yokohama AVS ES100s are quite loud now, though.
I have to decide if I'm going to eventually replace them with OEM style tires (Dunlop SP Sport 9000) or something else (Pirelli PZero?).