I did see an article that Obama is evaluating a new tax, because we don't have enough for the average person already. In addition to fuel tax, they are considering a mileage tax. When you pay for fuel, a GPS recorder will calculate miles driven and you will pay an additional fee at the pump based on your mileage.
Obama shot this down from the get go. It was never proposed or evaluated by him. Ray LaHood brought it up in reference to a program Oregon has toyed with, and when it was asked what the President thought about it, it was immediately said that it wasn't even considered.