Most GT mustangs wear out the rear tires because when you push on the accelerator the torque pushes down the tire against the pavement increasing friction. This is a normal wear characteristic of most RWD vehicles, just like the front tires wear on front wheel drive (plus more weight on FWD tires).
This is assuming of course you don't have stupid front alignment angles or dumb suspension like twin I-beam explorers that scrub the tread off the front tires as well.
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2005 Suzuki Hayabusa GSX1300-R
1980 Ford Thunderbird - 255 V8
ported heads, 5.0L ported stock headers, O.R. H-pipe and Flowmaster 2-chambers, dual roller timing chain
hi-po Mack Truck hood emblem 
1985 Mustang GT 5.0L T5, F-303, GT40p, headers, off-road h, flowmasters, MSD stuff, etc.
Sold 02/06/04 
1989 Mustang GT ET: 13.304@102.29 mph (5-24-03)
Sold - 1998 Mustang Cobra coupe, 1/4 mile - street tires: 13.843@103.41 (bone stock)
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