(CBS DETROIT) – 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, that price average is hovering at $3.18 a gallon.

"If crude oil prices continue to rise, gas prices will likely follow suit," said Adrienne Woodland, spokesperson, AAA-The Auto Club Group.

The range the organization found among gas prices in Michigan includes:

Most expensive average price per gallon

• Metro Detroit - $3.18
• Ann Arbor - $3.17.
• Saginaw - $3.15.

Least expensive average price per gallon

• Traverse City - $3.01.
• Benton Harbor - $3.09.
• Marquette - $3.15.

AAA's tips for saving on costs include:

• Drive conservatively; as aggressive acceleration and speeding reduce fuel economy.
• Remove excess weight in the vehicle.
• Combine errands to limit driving time.
• Enroll in savings programs at your favorite stations.