Average retail gasoline prices in Michigan have risen 17.2 cents per gallon in the past week, averaging $3.74 per gallon Sunday, according to GasBuddy’s daily survey of 4,913 gas outlets in Michigan. This compares with the national average that has fallen 1.6 cents per gallon in the past week to $3.50 per gallon, according to gasoline price website GasBuddy.com.

Including the change in gas prices in Michigan during the past week, prices yesterday were 7.2 cents per gallon lower than the same day one year ago and are 8.6 cents per gallon lower than a month ago. The national average has decreased 14.5 cents per gallon during the past month and stands 34.7 cents per gallon lower than this day one year ago.

“The slow trend downward in the national average has survived another week,” said GasBuddy.com Senior Petroleum Analyst Patrick DeHaan. “While unprecedented, the decline in the national average certainly has delighted motorists who are used to large spikes in gasoline prices that come with the territory of springtime. With Memorial Day just five weeks away, there’s good news for motorists: Prices will likely continue to lag behind year ago levels,” DeHaan said.