They are looking at charging a per mile tax in California instead of tax at the pump for the same reason.Here in VA they're actually getting ready to pass an Alternative Fuels Tax. They're going to charge Hybrid and alt fuel vehicle owners an extra $100 a year because they don't buy as much gas, and therefore aren't paying their fair share of gas taxes.
Yeah, I know. Wtf right?
Cars are getting better MPG which equates to similar wear and tear on the roads with less money in the coffers to maintain them. I guess it makes sense for every driver to pay their fair share of road usage, but tracking every ones mileage seems a bit ridiculous.