I tried a $99 plug that promises to track your car and send help when needed — without selling your data

The Miles is a smart plug for your car. My 15-year-old daughter just got her learner's permit, so when I was pitched a new gadget tailored to teen drivers, I was intrigued. The Miles Plug is a small device that plugs into your car's OBD-II port and monitors location, driving habits, and vehicle…