Michigan motorists are finding some relief at the gas pump this week after recent spikes in prices due to refinery issues, based on a new survey from AAA Michigan. The Auto Club survey found the statewide average weekly gas price has decreased about 16 cents from the previous week, to $2.84 per gallon. That's also 66 cents less than this same time last year. Among the cities surveyed by AAA for self-serve unleaded fuel, the lowest average price can be found in the tri cities area, where it’s $2.76 per gallon. The highest average price is in the Marquette area, where it’s about $2.91 a gallon. Locally Port Huron pumps are asking about $2.84 per gallon for regular unleaded.