Gas price drops 27 cents over 3 weeks while crude oil strengthens

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In this Thursday, July 16, 2015 photo, a customer re-fuels her car at a Costco in Robinson Township, Pa.

NBC News - The U.S. average price of gasoline dropped 27 cents over the past three weeks, to $2.44 a gallon.

Industry analyst Trilby Lundberg said Sunday that the pump price fell even though crude oil prices gained strength, as gasoline supply outweighed demand.

Further price drops are likely if crude oil prices don't skyrocket, because the Sept. 15 change to winter grade gasoline comes with a cost cut in much of the country.

The cheapest price recorded in the continental United States was Charleston, South Carolina, at $1.94.

The highest was $3.31 a gallon in Los Angeles.

The national average price of diesel was down 9 cents over the past three weeks to $2.63 a gallon.

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