Why gasoline prices vary across the U.S.

The average gas price in the U.S. recently reached a seven-year high, topping $3 per gallon. However, looking at the national average figure doesn't tell the whole story. At $2.982 per gallon, Oklahoma has the lowest average gas prices in the country. In California, gas prices are averaging $4.531 per gallon. But why do prices vary so much from state to state? Watch the video to find out.