BOISE, Idaho – Boise gets the slightest break at the pump this week, with prices dipping 0.3 cents per gallon on average. The new average for a gallon of gas in Boise sits at $3.11 on Monday, according to GasBuddy’s survey of 216 stations in the Boise area. Prices in Boise are 30 cents lower than a month ago, and are 57 cents lower than a year ago.