Where can I find a chart/graph that list the price of a gallon of gas in the US over the last 20-40 years?

Question

Any help would be appreciated.

Answer 1

The Energy Information Administration of the Department of Energy produces the data in excel format for historical prices of gasoline. It is in data form so you need to create the graph or chart for it

http://www.eia.doe.gov/oil_gas/petroleum...

If you need more data I suggest you contact them  

Answer 2

http://www.inflationdata.com/inflation/i...