Gas prices in the state dropped 3-cents over the past week, that’s according to AAA of Michigan. Drivers are paying an average of $3.18 a gallon for regular unleaded. Metro Detroit still has some some of the most expensive fuel in the state with and average of $3.27. The lowest prices can be found in West Michigan where it’s $3.09 a gallon. Port Huron area pumps are right around the statewide average of $3.18.