You definitely need to run at least 500-1000 miles to get the rings seated.
Personally, I would just wait until the first oil change. BTW, don't expect to see big mileage gains. Mine was barely noticeable.
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Peace, it's our only chance
1998 E150 Club Wagon, 4.6L Modular, E4OD
2007 Milan. 3.0L Duratec, Aisin 6 speed AW-F21
others I look out for
2007 Escape 2wd (the mini Pumpkin), 3.0L Duratec, CD4E
2008 Mazda3 5 door, 2.3L, 5 speed manual
My advice is worth every cent you pay for it ! | 
