No, it's going to be increased. I heard some "analyst" on the radio today say we're "lagging" "terribly" behind Europe, where the tax is several dollars per gallon! We've got to catch up! A per-mile tax won't stop them from keeping - and raising - the per-gallon tax.
LOL. Catch up with what? Their high unemployment and stagnant economies? Raising taxes will go a long way to meeting those goals.
When I heard the socialists at the OECD kvetching about "unfair tax competition" (how dare people be able to move their investments to countries with lower tax rates) I thought there was no such thing. Now I can say I was wrong, there actually is unfair tax competition (compete with Europe to make sure we're just as confiscatory as they are)!