Average US gas price fell 6 cents to $3.41 per gallon; Chicago area at $3.65 Average US gas price fell 6 cents to $3.41 per gallon; Chicago area at $3.65 December 20, 2021 dzadmin Comments 0 Comment The average U.S. price of regular-grade gasoline dropped by 6 cents over the past two weeks to $3.41 per gallon.