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The average price of a gallon of regular gas in Sonoma County continues to gradually fall. Today it’s $5.31, down a cent from Sunday. It’s also six-cents cheaper than it was a week ago and 29-cents cheaper than it was a month ago. Napa County still has the most expensive gas in the North Bay, at $5.42 per gallon today. The statewide average went down a cent overnight to $5.04. The cheapest gas in Sonoma County is at the Costco in Rohnert Park were a gallon of unleaded is $4.95.