NEW YORK (CBSNewYork/AP) — Motorists are paying more to fill their gas tanks. The Lundberg Survey says the average price of a gallon of gasoline has gone up 18 cents over the past two weeks.

The Lundberg Survey of fuel prices puts the average price for a gallon of regular at $3.69, about 8 cents higher than the same time last year.

Nationally, a gallon of mid-grade averages $3.84 and premium $3.96.

1010 WINS’ Steve Sandberg reports

In New Jersey, drivers are paying $3.61 for a gallon of regular compared to $3.35 a month ago. In New York, it’s $4.03 a gallon, up from $3.76 last month. If you fuel up in Connecticut, the current average is $3.95 compared to $3.68 last month.

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Analysts say one factor for the summer gas price spike is an increase in crude oil prices.

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Right now, a barrel costs $94 compared to late June when it was only $78. Economists say that’s a result of production outages in South Sudan and western sanctions on Iranian oil.

Problems with refineries and pipelines in the West Coast and Midwest are also factors, including a massive fire in California.

“While these situations are temporary in nature, it goes to show this nation’s dependence on domestic refineries,” Senior Petroleum Analyst Patrick DeHaan said in a statement.

But DeHann said there is some light at the end of the tunnel for drivers.

“Driving season will be over in less than a month and soon thereafter the EPA also relaxes gasoline mandates, meaning cheaper winter fuel,” DeHaan said.

Tucson, Ariz., has the nation’s lowest price at $3.18, while Chicago had the highest at $4.23.

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