(September 30, 2015) WASHINGTON — The national average price for regular unleaded gasoline has remained relatively stable over the past week, reaching a price of $2.29 per gallon, following a decline of 37 consecutive days. Although this week's average is up by fractions of a penny compared to one week ago, pump prices have fallen for 26 of the past 30 days for a total monthly savings of 20 cents per gallon, AAA reported in its weekly summary.