Analysts said the recent decline in gas prices is likely to be short-lived. The price of gasoline in the U.S. has fallen for 24 consecutive days after hitting a record last month. But analysts said prices might rise again if demand from drivers increases and supplies are constrained. The average cost of a gallon of unleaded gas was $4.72 on Friday. That is down about 6% since prices hit their highest point, $5.02, on June 14, according to data from OPIS, an energy-data and analytics provider.