The greater fuel efficiency of cars means fewer gallons of gas are being sold, so less tax money gets set aside for road-building.
It's an issue on the water, too… recreational boating has increased in Oregon in the past five years, but fuel tax revenue declined. And so did motorboat registrations.
So the state marine board approved a motorboat registration fee increase, from $3 a foot to $5 a foot, pending legislative approval.
We hear about the increase, and where the money goes.