The national average price for regular gas is $3.165 per gallon on Monday. 

According to AAA, gas prices increased slightly from a week ago, when a gallon of regular gas cost $3.149. On a positive note for commuters, Monday’s fuel costs were less expensive than a month ago, when a gallon of regular gas cost $3.262, and a year ago, when they were much more expensive, at $3.652 per gallon.