Like I said. If gas drops to $1.50 a gallon the feds and the states will add enough tax to bring it back up to $3.50 a gallon or so. California complained that the electric cars weren’t using enough gas and the state was loosing gas tax revenue.
For practical purposes, most road construction and maintenance is paid by gas taxes.
Wear on roads is a product of vehicle weight and miles driven. Electric cars pay no gas tax, and thus nothing towards maintenance of the road. They are freeloaders on the highways, though they cause the same wear as an gas car.