I dont think you will get more than 5000 miles out of the Toyo R888s, all that torque going to the front wheels all the time will wear down that rubber fast, also i really don't like the feel of the R888's compared to Michelin sport cups, seems to lack the clarity of steering compared to a cup tyre.
You only really need a semi slick tyre if you are mentalist like Jonny
or do a lot of trackdays,
imo semi slicks give an awesome steering feel + grip but unless you really do go tits out everyday they are a waste !