[TSY]

To the OP

I guess it really depends on what you want and how much you're willing to spend.

Ideally, a different set for street and track- one for show and one for go. And if you are doing a lot of track time the extra wear and tear you save driving around town and to and from the track might pay off over time (especially if you move up to R-comps)

If you're just driving on track for fun and no one is timing you, then spending thousands of dollars on tires to save you 4/10 per lap probably isn't really cost effective.

And as poor as these OEM Prius tires are, it certainly is fun to be on the edge of grip and slide the back end a little. So maximizing your lap times and grip may not be the most fun you can have with this car.