After reading your article about Iowa's gas tax, I thought of one thing the article never mentioned. If the tax shortfall is bad now, it will get even worse as electric cars such as the Chevrolet Volt and Nissan Leaf gain in popularity. I feel that the owners of these vehicles are cheating the state, as well as those who own gasoline-powered vehicles.
Instead of tax breaks, electric-vehicle owners should pay a surcharge on their registration. This way, everybody will pay their fair share of maintaining the infrastructure, as I have done with every car I've owned since 1972.