there's 55 gallons in a barrel of oil. $10 / 55 = ~ 19 cents per gallon, which makes perfect sense since it was announced with this plan that it would cost less than a quarter per gallon.
gas is currently under $2, so even if your nightmare scenario came true of a dollar per gallon directly as a result of this fee ( can you explain how that'll happen? because I think we're a little fuzzy on exactly how 20 cents becomes a buck. ) then gas will be closer to $3.00, not $5.00 ( how does $3 become $5 ?? I'm not very clear on that part either ) but go ahead and call your congress critter and complain about it, maybe he can't do math either.