I can guarantee you that your car already has a device that tracks how many miles you drive.
Read Vi's link. They want a way to easily and remotely grab mileage. Right now the black boxes are mainly proprietary systems by each manufacturer. Hell, Toyota wouldn't even give the government a way to read them until the federal government "compelled" them to give them readers during the sticky pedals fiasco.
By mandating what and how the boxes operate it's simple to remotely grab whatever they want. Hell, even NHTSA said they wanted "more information" from the boxes.
Poke fun all you want, but there is a growing desire to tax per mile as fuel efficiency rises. Hell, there's even been legislature proposed. Less gas used = less tax money, they WILL find a way to get that money.
This has bad idea written all over it.
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