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Hiya I was just wondering how accurate the Nike+ shoe sensor is? I have recently ust gotten back to running after a while off and did the usual what I though 7 mile route. when i used to do it it took around 1hr but I just did it in 52 minutes and nike is saying I only ran 6. When I checked it out on MapMyRun it said 7. Now I dont know what to believe! does this mean I have just smashed my run after oming back to it from other sports?