Alignment Problem with 2003 Mustang GT

I was wondering if anyone else has had any problems with their Mustang GT coming out of alignment frequently. When I went in for the 15,000 mile maintenance at the Ford Dealership they told me that my alignment was off and it was wearing badly on my tires. They said since alignment was based on how individuals drive that it was not covered under the warranty. I paid to have the alignment redone. Now at 29,000 miles I am looking at buying new tires for the GT and having to get it re-aligned. Is this an issue possibly covered under warranty or is this just how I am driving the car. I owned a different car for 6 years and only got it re-aligned once. It never needed new tires, so I am wondering if maybe their is something wrong with the car itself. Could someone please add some insight into my problem?

Thanks,

Randy

id take it to a private shop and haven him look at it. then take the diagnostic back to the ford lot. most dealers will try to weasel thier way out everytime.