i'm a new user of the device through my insurance co., American Family. Been using it for 6 weeks. The data it shows isn't accurate per the way I drive. It shows avgs in mph range of 18-23. But in the area I live in FL, our minimum speed limits are 30+, I mostly drive in 45mph speed limit areas. I never have a reason to drive below 30 and always drive 3-5 mph over the speed limit. Why is this happening? Do I have a faulty device?