OP, do you have adjustable camber plates installed? If so, what are you current settings?
Also, since you are still looking to drive the car around town, it would be best to run an extreme summer tire like the Hankook RS-3, Dunlop Direzza ZII Star Spec's, or Yokohama AD08-R. All three of these would be vastly superior then the MPSS on track, as they can handle the repetitive lapping without the degradation you experience from MPSS (assuming you have the proper amount of negative camber dialed in to prevent shoulder wear). All three of these tires can be driven daily, are capable of being quite fast on track, and will last much longer then the RE-71's.
No doubt, the RE-71 is a bit faster is you are after breaking PB's, but your tire costs will increase substantially over the season. It is always a trade off
Since manufactures can list their own treadwear ratings, you will find that there is a bit of variance. RE-71R's are really more in line with r-compounds like the Nitto NT-01.
- Ryan