Will this new law also apply to those crazy guys that power their diesel cars off used french fry grease they get from restaurants?
My brother knows one of those "crazy guys" that runs his diesel vehicle from vegetable oil. He somehow got on the radar of the DOT and was accused of not paying the road tax. I don't know if he paid any penalties for that but since then he's had to take his vegetable oil fuel someplace to get measured out and pay a road tax on it. I'm not sure how they track this, that wasn't made clear in the retelling, but there's apparently a system laid out for enforcement on paying the road taxes on fuel.
A common problem here in rural America is people buying "red diesel" for burning in their over-the-road vehicles. Red diesel is just regular diesel fuel with some red dye in it to mark it as low tax fuel for off-road use such as for agricultural tractors, backup generators, and so forth. Small time users that will have a diesel tractor for mowing a large lawn, small time construction work, and whatever, will just get higher taxed fuel without the dye at a truck stop as the extra cost isn't worth the effort to seek out a place selling red diesel. Those that burn a lot of red diesel will have it delivered to them by a fuel truck. It would be tempting to fuel up their diesel truck off this lower cost fuel from a tank they keep on site than go to a truck stop for higher priced fuel. If caught then that can mean hefty fines, fines far higher than just making up for the road taxes not paid.
The idea of using a GPS tracker to count miles for accurate taxation just sounds like an excuse to put GPS trackers on vehicles. We have odometers, and tampering with the odometers is severely penalized already. Part of this is the odometers are made to be difficult to be tampered with. There will be seals on the odometer that will indicate tampering. There are mechanisms that cause the odometer to self destruct if there's an attempt to roll them back. With so much electronics in a vehicle now there's likely multiple odometers, with one being mechanical and another electronic somewhere. There's ways to compare the two and if there's a mismatch, and no records indicating a repair or something to explain the disparity, then that can lead to fines.
I agree that fees need to be paid for road repair. Charging a per mile fee on electric vehicles, based on the odometer readings, sounds like a logical means to resolve that. Claims of being unfairly charged for miles driven in another state, or country, or for miles driven off-road, such as a farmer or rancher that might drive many miles on their own property in their diesel truck, might just mean having to eat those fees for the convenience of not having to explain the time spent driving someplace other than where the taxes go to pay for the roads. This is routine already where people pay the fees on diesel fuel from a truck stop than seek out red diesel. Is this such a big fee that we should go through the expense of paying for a GPS tracker to avoid them when not in the country or not on roads paid for by the taxes?
I can recall hearing about how truck drivers that cross state lines often will keep some kind of log to make sure they are paying the correct taxes on fuel. Drivers in the Midwest USA know that fuel taxes in Illinois are quite high and so will do their best to avoid filling up in the state. Illinois knows this and so they will track commercial drivers to collect on those taxes than tolerate trucks filling up in neighboring states to avoid the fees. The non-commercial drivers aren't tracked because it isn't worth the trouble. Are they going to track passenger cars driving across the state without stopping for fuel? That level of enforcement would likely cost more than what they could collect, so they don't bother.
In short, we already figured this out without resorting to GPS tracking. If people want to avoid the fees then they should keep good logs on their driving and odometer readings. If they want some GPS tracker to do this for them then they should have to pay for it from their own pocket. It's that or they can simply pay the fees to avoid the bother of tracking the miles.
The idea of odometer tampering isn't new. We've pretty much solved that issue. Maybe this per mile fee will encourage more effort into tampering with odometers but I'm fairly certain existing efforts to detect this tampering are sufficient to prevent this being some widespread issue.