U.S. gasoline prices are set to fall to the lowest level since 2020, thanks to increasing supplies, despite some ongoing refinery maintenance, GasBuddy has predicted. GasBuddy has predicted that U.S. motorists will pay an average of $2.79 per gallon on Christmas Day, down from $2.95 per gallon a year ago. That will mark the cheapest gas since prices averaged $2.26 per gallon in the Christmas of 2020. The Energy Information Administration has projected that rising global oil inventories will put downward pressure on oil prices, with a gallon of…