The 5 states with the lowest average cost of gas — and the 5 with the highest

• The American Automobile Association tracks average gas prices in every state.
• Mississippi has the lowest gas prices with an average cost of $2.937 per gallon.
• California's gas prices are the highest in the US with an average cost of $4.794 per gallon.

Gas prices have fluctuated dramatically over the last few years, according to data from the US Energy Information Administration, or EIA.