The darkening clouds of the slowing economy could provide a bright spot for consumers: gasoline at $3 a gallon — or less — by autumn.
Nationally, regular gasoline averages $3.47 a gallon, down 47 cents from this year's high in April and well below the $5-a-gallon fears fanned earlier this year by energy speculators, Middle East tensions and oil refinery glitches that crimped supplies.
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