Average retail gasoline prices in Lincoln have risen 16.9 cents per gallon in the past week, averaging $3.38/g Sunday, according to GasBuddy's daily survey of 146 gas outlets in Lincoln. This compares with the national average that has increased 4.5 cents per gallon in the last week to $3.31/g, according to gasoline price website GasBuddy.com.

Including the change in gas prices in Lincoln during the past week, prices Sunday were 7.5 cents per gallon higher than the same day one year ago and are 21.7 cents per gallon higher than a month ago. The national average has increased 4.5 cents per gallon during the last month and stands 6.7 cents per gallon lower than this day one year ago.

"The national average has picked up in the last week on the apparent start of refinery maintenance season," said GasBuddy.com Senior Petroleum Analyst Patrick DeHaan.

"Refinery production has taken a hit in the last week as companies begin looking towards the summer driving season, utilizing this time of year for maintenance and any upgrades before gasoline demand races higher for the summer season," DeHaan said.