question about my tires?

[bobby95m3]

ok i have two toyo tires that have lots of tread left on them. not sure how many miles on them. maybe like 15k. I also have two sumitomo tires that have more tread on them. they only have about 5k on them. My question is should i put the sumitomo tires in the front or the back? i want the best traction when i do auto-x and track racing. what should i do?
thanks

[SG_M3]

toyos up front, others in the rear.

[cbraga]

given equal tires front and back, which tend to wear faster on track? fronts?

thanks