I was hoping you guys could help with an odometer problem. So I noticed that the mileage on my car was going up pretty quickly for the amount of time I've owned it. So I did a little test and had my dad drive to the same place that I was driving to. For the same trip, my car read 9.7 miles where as his read between 8.9 and 9.0 miles. I have aftermarket 3.73 gears with a SpeedCal Calibration device. Do you guys think the calibration device may not be working?