Michigan’s average gas price has set a new record, rising 44¢ in the past week to $5.04 a gallon. Triple-A Michigan says that’s 74¢ higher than last month and $2.02 above last year. Metro Detroit has the highest prices in the state with an average of $5.12, and Marquette’s $4.96 is the lowest average. A 15-gallon fill up is now over $75.