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I think for the time being, fuel taxes alone are the way to go. You use the road more through either heavier vehicles or more miles driven, you pay more. And it gives an incentive to drive more efficiently.
A few years down the road, when EVs become more prevalent, this will have to change. Then we should go to some sort of mileage charge as it is impractical to use a fuel tax on watt/hrs.
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