We already get charged enough to use the roads!
I'll take the US fuel charges over the UK's any day. £1.37 a litre. That's about $2.12 a litre. There are 4.55 Litre's to a UK gallon, but I think your gallon's are different over there.
Any how it adds up to a lot of money. Thats without Road Tax (about £175 a year) and car insurance (about £300 a year, and finally an MOT (road worthiness certificate) which is about £35 (plus whatever the garage 'finds' to fix!).
Lastly is servicing (which done regularly will improve the efficiency of the engine) if you have any money left of course!
The sooner they invent the transporter, the better.