Michigan drivers are paying an average of $3.15 per gallon for regular unleaded gas, according to this week's report from AAA-The Auto Club Group. This is up 12 cents from the previous week. In metro Detroit,

In the Gem State, the lowest-priced station was $2.29 per gallon, whereas the most expensive station was $4.04 per gallon, a difference of $1.75 per gallon. The national average for a gallon of gas has dropped roughly six cents, with a new average price of $3.09 per gallon.

The price is 8 cents more than this time last month and 11 cents more than a year ago, according to the group.

According to GasBuddy price reports, the cheapest station in Oregon was priced at $2.91/g Sunday while the most expensive was $4.15/g, a difference of $1.24/g. The lowest price in the state Sunday was $2.91/g while the highest was $4.15/g, a difference of $1.24/g.

Gas prices have once again risen over the last week in the Treasure State. GasBuddy.com reports average gasoline prices in Montana have jumped 7.7¢ per gallon in the last week and are averaging $2.86 per gallon as of Monday,