the poster you are replying to misunderstood my sentence. there's no reason to directly tax powerful vehicles, unless you are using it as a weird proxy for fuel efficiency, which is already captured by per gallon fuel taxes.

I'm saying we should tax vehicles in proportion to some integer power of vehicle weight, since the road damage is superlinear with respect to vehicle weight. a big truck that weighs ten times as your Cayman does much more than ten times the damage. since we're trying to fairly distribute the costs of transit, the operators of these vehicles should be paying the lion's share of maintenance costs.