Gas prices up 2 cents in past week AAA Mich.: Gas prices up 2 cents in past week Jan 30 12:24 PM US/Eastern (AP) - AAA Michigan said Monday that gasoline prices are up about 2 cents per gallon during the past week to a statewide average of $3.42. The auto club said the average is about 26 cents per gallon higher than last year at this time. Of the cities it surveys, AAA Michigan says the cheapest price for self-serve unleaded fuel is in the Flint area, where it's $3.38 a gallon. The highest average can be found in the Marquette area at $3.51. Dearborn-based AAA Michigan surveys 2,800 Michigan gas stations daily.