The usual explanation is that they want to tax only in-state travel, so they need the location data. That seems like something that one ought to be allowed to

The usual explanation is that they want to tax only in-state travel, so they need the location data. That seems like something that one ought to be allowed to opt out of in favor of an odometer reading; I do something like 99% of my driving in my home state, and would rather just go with an annual odometer reading and maybe slightly overpay on my road taxes than have a tracking device in my car.