Stupid pedometer

I put a new battery in my pedometer and took off around campus. Problem is that, with switching shoes, the pedometer appears to be off somewhat. I think it's sensitive to where, exactly, you place it on the shoe. You see, you tell it your stride and then with every foot strike on the pavement it tallies up your mileage. But if it misses a strike every now and then because it doesn't get jostled enough or whatever then your total is off. And this messes up the pace it calculates. So while I clearly ran over 3 miles in just under 30 minutes the pedometer came up with an 11-minute mile. I don't think so. So now I've got to monkey around with the damn thing until it starts reading more accurately. I seem to recall having to do this many years ago when I first got it. I went to the track and ran laps, fiddling with the settings every so many laps, until I had it calibrated. Apparently I'm going to have to head to the track on campus to get it working correctly again. Who knew that buying new shoes would end up wrecking such havoc.