CAMARILLO, Calif. (AP) — The national average retail price of regular-grade gasoline dropped 3 cents in the past two weeks to $4.24 a gallon, the Lundberg Survey reported Sunday.

That brings the total decline over six weeks to 19 cents a gallon, leaving the current price $1.27 above its year-ago point, the survey said.

Mid-grade gasoline averaged $4.57 a gallon and premium averaged $4.83.

Nationwide, the highest average price for regular-grade gasoline in the April 22 survey was $5.71 in the San Francisco Bay Area. The lowest average was $3.70 in Tulsa, Oklahoma.

Lundberg surveys a national panel of markets twice monthly.

“Although crude oil prices rose in this period, the past few days saw them drop,” industry analyst Trilby Lundberg said. “This with a big loss of business margin by retailers allowed the average price to decline. Unless oil prices fall further, additional drops in pump prices are likely to be small or none.”