As You’ve Probably Noticed, Gas Prices Have Risen To Their Highest Level In 2015 This Week. The National Average Price Of Regular Unleaded Gasoline Has Moved Higher Now For 23 Consecutive Days, Up 27 Cents A Gallon. Due To Higher Crude Oil Costs And A Number Of Refinery Issues, The National Average Gas Price Of $2.66 Represents The Most Expensive Average Price So Far This Year.