 A measure boosts fines for offending businesses to $7,500, and the suspension time for a liquor license also rises to 30 days. Maine drivers are finding consistent prices at the pump when it comes time to fill up their vehicle. According to AAA, the average cost for a gallon of regular fuel in Maine, now $3.50. That's the same as it was last week, but it is seven cents higher than what motorists were paying this time one month ago. Right now, the national average for fuel is sitting at $3.52.