ATLANTA (CNN) -- Gas prices have jumped nearly 20 cents over the past two weeks, approaching the all-time high, according to a survey published Sunday.
The average price of a gallon of self-serve regular is $3.76, the Lundberg Survey found. The previous survey three weeks ago found an average of $3.57.
That means prices are now just 35 cents -- "within firing range" -- of the all-time high of $4.11 set in July 2008, said publisher Trilby Lundberg.
"This doesn't mean that we will get there," she said. "Crude oil will decide."
Crude prices have been impacted by the unrest in the Middle East, she said, but also by two other major underlying factors: increased demand in developing nations and the weak dollar.
"Unless crude oil relents and slips, we can expect a further rise at the pump because pump prices do not reflect all of the crude oil price hikes that have occurred," Lundberg said.
The latest Lundberg survey, which tabulates prices at thousands of gas stations nationwide, took place on Friday. Of the cities surveyed that day, the lowest average price was in Tucson, Arizona, at $3.41. The highest average price was in the San Francisco Bay area at $4.13.
Here are the average prices in some other cities:
-- Chicago - $4.11
-- Seattle - $3.85
-- Boston - $3.71
-- Houston - $3.67
-- Atlanta - $3.61
-- Memphis, Tennessee - $3.56
Land O'Lakes CEO Beth Ford charts her career path, from her first job to becoming the first openly gay CEO at a Fortune 500 company in an interview with CNN's Boss Files. More
Honda and General Motors are creating a new generation of fully autonomous vehicles. More
In 1998, Ntsiki Biyela won a scholarship to study wine making. Now she's about to launch her own brand. More
Whether you hedge inflation or look for a return that outpaces inflation, here's how to prepare. More