U.S. regular retail gasoline prices averaged $2.14 per gallon (gal) in 2016, 29 cents/gal (12%) less than in 2015 and the lowest annual average price since 2004. Lower crude oil prices in 2015 were the main cause of lower gasoline prices. In 9 of the 10 cities for which EIA collects weekly retail price data, gasoline prices did not exceed $3.00/gal.
Source: Today In Energy