How does miles driven affect your car insurance?
and
http://www.amazon.com/Escort-Passport-8500-X50-Detector/dp/B00028D778
Because at least state farm asks you what the use of your car is for and how many miles you drive it. Some, like progressive, offer you to install some device in your car to monitor your driving habits.
http://www.progressive.com/auto/snapshot-how-it-works.aspx
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