Average retail gasoline prices held steady over the last two weeks, due to robust supplies despite increasing demand as summer approaches, according to a nationwide survey released Sunday.
The national average for self-service regular unleaded gasoline rose less than 1 cent to $1.4278 a gallon in the two weeks that ended May 17, 30 cents below the level last year, according to the weekly Lundberg survey of 8,000 gas stations.