back tires usually always wear faster than the front on a mustang lol
i wouldnt run a drag radial on the street, they are soft and ANY sort of tirespin on the street, asphalt or concrete will eat a drag radial alive. they are just too soft for the street, and when i ran mine on the street they didnt really hook better than the street tire, they may have if i heated them up but i wasnt about to heat them up on the street and ruin them
sure they are DOT approved but i would only run them on a weekend only street drag car that only drives to the track.
i ran some nice BFG drag radials on the street, i got them used but they are ALOT of tread. i ran them for 2 months on the street before i ever got to the track and by the time i got there they were almost bald and i ran 14 passes that day and pretty much finished them off. and i dont spin the tires on the street alot, just the occasionaly back road roar and fun, no burnout either, just tire spin from punching it 1st and turning them over and spinning in 2nd
if your looking for traction at the track, i would get an extra set of rims and get a nice drag radial or slick and put them on at the track.
as for street traction, its all in the foot, ease into the throttle dont just floor it and hope it hooks or get some suspension upgrades. control arms, adjustable shocks and drag springs.
i got the arms, drag shocks.struts and stuff and it helped street traction a great deal. went from tire spin to hooking in 1st gear, still have to play with the gas a tad bit but thats just what you get into when hopping up a car.