This compares with the national average that has fallen 4.5 cents per gallon in the last week to $3.49/g, according to gasoline price website GasBuddy.com. Including the change in gas prices in Arkansas during the past week, prices yesterday were 38.7 cents per gallon lower than the same day one year ago and are 10.3 cents per gallon lower than a month ago. The national average has decreased 7.3 cents per gallon during the last month and stands 32.1 cents per gallon lower than this day one year ago. "Gasoline prices continue to move lower nationally as we've now officially moved into fall," said GasBuddy.com Senior Petroleum Analyst Patrick DeHaan. "Looking forward, we're likely to see additional relief at pumps in the months ahead, and it's quite possible that by the time we're observing Thanksgiving that gasoline prices will be twenty or more cents per gallon lower. Californian motorists will see among the larger decreases in the week ahead as refinery issues have become barely visible in the rear view, which has led to a dramatic downward shift in wholesale gasoline prices," DeHaan said.