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Pay per mile on public roads is the most fair, with the multiplier based on the wear and tear the car causes to the road.

I would never trust any sort of gps system to not be used against me however.

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I would envision such a system to be based purely on odometer reading since that might be easiest from a logistics perspective

that would be good, but UK politicians are very interested in pricing usage based on time of day

which doesn't work if you only check the odometer once/year

One idea that comes to mind that would be relatively simple sanity check is data from average speed cameras that UK has. Somewhat dystopian solution would actually be also track distance driven between these. And add it together over the measuring period.

Wear and tear scales with the fourth power of the weight on an axle. So this does provide a strong incentive for lighter vehicles, it also becomes a drag on moving things in the economy which is not so desirable, and essentially becomes a kind of consumption tax, which is perhaps a bit more progressive than fuel duty though I’m not sure.

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