Michigan gas prices are edging their way upwards for the summer season.  AAA-Michigan says the statewide average is up three cents a gallon making it  $3.54 a gallon for unleaded self serve gasoline this week.  The auto club predicts that prices will continue to be on the raise throughtout the summer and is not expected to drop until October.  In the Blue Water Area, gas prices are sitting around $3.55 a gallon which is where gas prices were last week. If you are in Northern Macomb or Southern St. Clair Counties, the price of gas is around $3.47 a gallon.