(CBS Detroit) -- Gas prices in Michigan have jumped 12 cents overnight.
According to AAA Michigan, the state average is now $3.74 a gallon, which is a nearly 40 cent jump from where it was this time last week.
AAA says Oakland County has the most expensive gas price with an average of $3.78.
Experts say the increase is due to crude oil prices hitting an all-time high for the first time in nearly eight years.
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