Am I a Mileage Fraud?

I think I’m a little anal retentive when it comes to mileage. When I first got my new Nike+ I was sure to calibrate it. I wanted every mile to be earned. Out to the track I went. The local track is is your basic 400 meter oval and I went for the requisite 400m trip around. I was sure to warm up first because I wanted my stride to be natural. I went for a lap, pressed stop and I got an error message. I did this several times with the preset 400m distance to no avail. Finally I punched in a custom distance of 0.4 km and off I went. By now I had run about 3 miles before I finished my calibration for 400m but I got it done.

Now some 25 runs later and about a 160 plus miles later, I find myself stuck in a winter wonderland of Kelowna. The sidewalks were covered in ice and so I retreated to the treadmill. I start my Nike+ and the treadmill at roughly the same time. After the first mile on my iPod the treadmill says 0.95 miles. WTF At first I thought maybe I didn’t start them at the same time after all. So I kept going fully expecting the two mile mark to come in at the 1.95 miles (taking into account my starting error). Much to my chagrin it came in at 1.90 mile, once again a full 0.05 miles off.

Needless to say after 5 miles on the Nike+, the treadmill was reading 4.75 miles. WTF! Is all my mileage off by 5%. Am I a mileage fraud? I’m going to re-test my mileage on a track. Maybe the treadmill needs calibrating. I’m going to run 2000 meters on the track which is exactly 5 laps. I’ll see exactly what the Nike+ reads and if it is still under I’ll re-calibrate at a longer distance like 2000 meters. If it is close or over then I’ll leave it. Oh the horror of being a Mileage Fraud.