Tampering with speedometers is illegal in most states.
In TN we have to get a yearly emissions inspection to renew the vehicle tags. They get the mileage then. Easy to calculate the miles driven from one year to the next.
Most states already do this. I’m not advocating this type of tax just pointing out it wouldn’t take a huge new agency to do it.
Although, it makes more sense to have a tax based on both vehicle weight and miles driven to use for maintenance of roads, does anybody believe for a second that a) it will replace or even reduce the gas tax, or b) any new funds generated from such a tax would actually be used to mantain roads. Yeah, and lottery money funds k-12 education