Electric, hydrogen, etc.
The Prius, while electric, still fills up at the local gas station. But if I buy a Volt and plug it into my wall at night, am I liable for any state/federal road tax? How is it computed?
Do vehicles that use hydrogen, CNG, LNG, or any other fuel pay road tax? How? Is the tax based on energy content (e.g. BTUs) or volume?
As a side question: Is the road tax on E85 (85% ethanol) the same, per gallon, as gasoline. E85 has about 30% less energy (and hence, poor mileage) than gasoline.