you may not have noticed but what you propose is exactly what both federal and state governments have been doing for the past hundred years or more. The price of gas varies per the state tax tacked on to the national fed tax. Its a good idea!
The power of the federal government to force private companies to increase the efficiency of their products has been enormously helpful. Seniors may remember gas @ $0,15/gal, driving cars at 5mpg, etc Of course some want to go back to the good old days like 100/200/300watt bulbs...