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Good news for consumers: gasoline prices are falling fast as oil prices plummet.

RBOB gasoline futures — which are traded on the New York Mercantile Exchange — plunged to $2.57 a gallon Wednesday morning, the lowest price since November 2012. Gasoline futures, which have slid 5 percent in the past week alone, have an even greater impact on prices at the pump than crude oil prices.

"It's fourth-quarter demand. There's always less demand for gasoline at the end of the year and that's what you're seeing. Plus there's plenty of supply of gasoline — and oil," said trader Anthony Grisanti of GRZ Energy and a CNBC contributor.

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The national average for retail gasoline is $3.34 a gallon, down 4 percent, or 13 cents, from a month ago, according to AAA. In 10 states, prices are below $3.25 a gallon on average — and many drivers in Oklahoma, Missouri and Texas are paying less than $3 a gallon, according to GasBuddy.com.



"Drivers in nearly half the country could soon find gasoline prices at the pump below $3 a gallon," says Tom Kloza, chief oil analyst at GasBuddy.com. "This is the other shoe dropping. Since September, we saw gasoline prices lose ground even though oil prices were congesting. Now that crude oil prices are dropping, we could soon see retail gasoline prices at the lowest prices since the Arab spring in February 2011— below $3.20 a gallon for the national average."

The benchmark U.S. oil price is at the lowest level since July. West Texas Intermediate crude futures hit a session low of $96.16 a barrel, sinking 4 percent in 3 days.



U.S. crude oil inventories have risen sharply since Oct. 4 as refineries have slowed processing, due to seasonal maintenance operations and domestic oil production that continues to rise. Meanwhile total demand for oil and refined products has dropped to the lowest level since June.

—By CNBC's Sharon Epperson; Follow her on Twitter: @sharon_epperson



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