Michigan presently is in the top five nationally in it's gas tax.  The nineteen cent per gallon state highway tax is just part of it.  Michigan also collects sales tax on the price of every gallon, including charging sales tax on the 18.4 cents per gallon federal highway tax.  If Governor Snyder succeeds in his plan for a tax at the wholesale level, Michigan will be the HIGHEST taxed state in the union for gasoline.
Border states with lower rates ( Indiana, Ohio, and Wisconsin ) get a windfall because of this, and Michigan loses the sales tax revenue on the other goods people buy to justify going out of state for their gas.
As always, I worry that once in office, Republicans drift towards the Dems.  Don't goive up your momentu!  Thanks Rep. Opsommer for standing against making gas more expensive for Michigan motorists.