Survey: Gas prices jump to near $3 a gallon

(CNN) -- The price of a gallon of gasoline has jumped back up near $3 a gallon, according to a survey published Sunday.

The Lundberg Survey found the average price for a gallon of self-serve regular was $2.96 on Friday, up 16 cents from the previous survey two weeks earlier.

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If crude oil prices don't retreat, gas prices could easily cross back over the $3 mark on average, said publisher Trilby Lundberg.

Prices reached an all-time high of $3.18 in May.

The current price, $2.96, is 78 cents higher than it was one year ago, Lundberg said.

The survey looks at thousands of gas stations across the country. It found the highest average price for a gallon of self-serve regular was in San Francisco, at $3.28. The lowest was in Newark, New Jersey, at $2.73.

Here are the average prices in some other cities:

Chicago - $3.13

Long Island - $3.05

Miami - $2.99

Las Vegas - $2.93

Atlanta - $2.89

Denver - $2.87

Dallas - $2.83

Boston - $2.82

Cheyenne - $2.77

Cleveland - $3.07