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• Fuel Focus: 2013 Annual Review

• U.S. Regular All Formulations Retail Gasoline Prices (Dollars Per ...

• U.S. All Grades All Formulations Retail Gasoline Prices (Dollars Per ...

• U.S.: Gas Prices By Year 1990-2021 - Statista

• Gas Prices, Down In '13, Set To Go Lower In '14 - CNN Business

• Why Gas Prices Are Rising - CNN Business

• U.S. Retail Gasoline Prices Averaged $3.49 In 2013 - MarketWatch

• Gas Prices Hit A Historic High: What's Driving Them Up?

• How Much Gas Cost Every Year Since 1978 - CNBC

• Could 2013 Gasoline Prices Hit Record Highs? - USA Today

• The Surprising Reasons Why Gas Prices Have Fallen Sharply

• Natural Gas Prices - Historical Chart | MacroTrends

• The Price Of Gas: Why It Goes Up And Down - The Balance

• Average Monthly Retail Motor Gasoline Prices In Nebraska