I've been to Milan, MCIR, and US 131.
131 bites best, and you can easily get 10-12 or more passes, but it's 3 1/2 hours from Lima.
Milan bites decent, and it's not hard to get 10 or so runs in. It's about 2-2 1/4 hours away.
MCIR...well, most people here have likely run it. It's the closest track to me, 1 1/4 hrs away, but traction is fleeting and the lanes are not too smooth. The left lane has a 'rut' where a stripe was ground off or something; hitting that in the GTP is torque-steer city. When it does bite, it bites hard; I ran my GTP's best there.
Also, they run bikes, quads, and Juniors on Fridays, so runs are few, usually 6 or 8.
The Tempo's first track outing might be there, though, because it's close. Might be willing to try a Columbus-area track. Any suggestions?