CHICAGO (CBS) — Gasoline prices are on the rise once again in Chicago, spiking more than 18 cents in the past week.

The average price for a gallon of regular gasoline was $4.10 on Sunday, according to GasBuddy’s daily survey of 1,437 gas outlets in Chicago.

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This compares with the national average of $3.62, an 11 cent jump.

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In Chicago, prices are 34.8 cents per gallon higher than the same day one year ago and are 28.0 cents per gallon lower than a month ago.

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“Nationally, gasoline prices have begun moving upward yet again. I suspect that the unrest in Egypt is playing a significant role in pushing crude values higher, and thus retail gasoline prices higher as well,” said GasBuddy.com Senior Petroleum Analyst Patrick DeHaan.