Like mole said, The longer they last, the less grippy they are. Tires are grippier because small pieces of tire litterally stick to the road. You can make extremely hard tires that last forever that have no traction at all if none of it sticks to the road.
I recommend the Kumho Escta HP4 716s for stock wheels. Thier 40-50 bucks each from
www.tirerack.com. Way grippier than stock RE92s, MUCH better in rain/snow, rides alot more comfortably due to softer sidewalls, and still lasted me a good year and a half....without rotation. They were still gripping well, but i rubbed a front tire and blew it and had to replace the front two in order to balance it out. Probably would have lasted about 2.5-3 years with standard rotation maintenance. Thier no 50k tires, but its like a whole new car with these tires over the stock tires.
I am an "enthusiastic" driver, but I have a friend with a Solara whos your every day driver, and she got the same tires i recommended and she likes em.