Our cost of living indices are based on a US average of 100. An amount below 100 means Michigan, Michigan is cheaper than the US average.A cost of living index above 100 means Michigan, Michigan is more expensive. Overall, Michigan, Michigan cost of living is 88.80.OST OF LIVING OVERVIEW. Our cost of living indices are based on a US average of 100. An amount below 100 means Michigan, Michigan is cheaper than the US average. A cost of living index above 100 means Michigan, Michigan is more expensive.