AUGUSTA (AP) — The average retail cost of a gallon of gas has gone up a penny over the past week.

Price-monitoring website MaineGasPrices.com reported Monday that the price is averaging $3.46 a gallon.

In-state prices remain 21 cents above the national per-gallon average of $3.25.

Maine prices are 3.9 cents per gallon higher than a month ago and 10.6 cents per gallon lower than at this time last year.

The price is based on a survey of more than 1,200 Maine gas stations.