Government makes more money on oil and gas than do the companies that actually make and sell the products.
Can you frame that with numbers. For example...
Exxon makes five cents profit on a gallon of gas while the federal government makes eight cents on the same gallon. That should clear up who is cheating drivers.
A short but good write up of the results can be found here: http://www.taxhistory.org/thp/readings.nsf/0/edf8de04e58e4b14852570ba0048848b?OpenDocument. Once established, even President Reagan, who campaigned against it, couldn't kill the beast for years.