this post was submitted on 08 Nov 2025
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Electric Vehicles
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A flat "per mile" is a bad way to measure road consumption for a vehicle. The more accurate measure is weight of the vehicle+mileage. A heavier vehicle will do more damage to roads. There is at least some correlation on petrol/diesel because a larger vehicle will have to consume more fuel to move a heavier vehicle.
However, if there is a flat 3p tax per mile irrespective of the weight of the vehicle, then smaller/lighter EVs will be paying disproportionately more of the cost of road damage than larger EVs.
Yeah but a city mile is different to a motorway mile. You could do loads more motorway miles, cause fewer issues to the road and pay more tax than the city driver that's constantly stopping and starting and torquing the road up.
If you want it to be proportional to road damage it needs to scale with the 4th power of vehicle weight and then multiplied per mile. That would make EVs a proper trade off (since they tend to be heavier).
Should also take into account the age of the combustion engine vehicle as it is more likely to be leaking oil which breaks down asphalt
Could it be simplified rather than just per mile? Instead give allowances in vehicle tax. Low medium and high usage kind of thing.