The U.S. average retail price of regular gasoline increased 2.3 cents this week to reach $3.94 per gallon, 26 cents per gallon higher than last year at this time. The only decrease came on the West Coast, where the price fell for the first time since December 2011, to reach $4.23 per gallon. Despite seeing the largest increase in the Nation for the fifth consecutive week, the Rocky Mountain price remains the least expensive region at $3.75 per gallon. Moving east of the Rockies, the Gulf Coast and East Coast prices both increased about four cents to reach $3.80 per gallon and $3.91 per gallon, respectively. The Midwest price increased less than a penny to reach $3.91 per gallon.