Helen H. Richardson, The Denver PostRoger Beatch fills his truck up with gas at a gas station on January 25, 2016 in Kersey. Travelers on Memorial Day weekend face gasoline prices slightly higher than a year ago, but that’s still a bargain. Nationally, gasoline prices heading into the holiday weekend are averaging $2.40 a gallon for regular unleaded, up from $2.30 a gallon a year ago, according to the U.S.