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he average price for all grades of gasoline fell 1.65 cents over the past three weeks to $2.16 a gallon, according to the Lundberg survey of filling stations nationwide.

The most popular grade, self-serve regular, averaged $2.13 a gallon, while customers paid $2.23 for midgrade and $2.33 for premium, the survey said.

The most recent drop follows a 6.4-cent drop in overall gasoline prices in the previous survey, taken between May 6 and May 20.

Lundberg reported the lowest price for self-serve regular gasoline was in Charleston, S.C., at $1.99 a gallon. The highest was in Honolulu, at $2.44.