Regardless of transportation cost attribution, the electric vehicle fees are meant to offset transportation funding, which ICE vehicles pay largely via federal and state fuel taxes. And which we as a society have decided is a political decision, separate from direct use/cost. Otherwise we'd have just stuck with everything being a toll-road.

Equating the marginal increase in pavement maintenance costs (due to trucks and heavy-loads) to the overall costs of building and operating a highway is also entirely wrong, but that's a bit tangent the point here.

I'm usually the first to point out the outsized amount of damage and wear attributable to heavy vehicles, but it's still a marginal increase of only one cost component in running a public transportation network.