I believe that the Nike+ site only uses the first mile run on a given day to be your fastest mile. They were working on fixing that - and I don't know if they have yet. For instance, if you go for a 3 mile run, and your middle mile is the fastest one, it won't give you credit for that as a single mile.
The way to beat it is to just go for a one mile run as fast as you can. I think. LOL
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