If your gas tank is on empty, it's a good time to fill up because these prices might not last for long.

Average retail gasoline prices in Billings have fallen 2.1 cents per gallon in the past week, averaging $1.79 per gallon on Sunday, according to GasBuddy's daily survey of 81 gas outlets in Billings. This compares with the national average that has fallen 2.5 cents per gallon in the last week to $1.80 per gallon, according to gasoline price website GasBuddy.

Including the change in gas prices in Billings during the past week, prices on Sunday were 6.8 cents per gallon lower than the same day one year ago and are 19.3 cents per gallon lower than a month ago, according to GasBuddy. The national average has decreased 19.8 cents per gallon during the last month and stands 25.3 cents per gallon lower than this day one year ago.

According to GasBuddy historical data, gasoline prices on February 1 in Billings have ranged widely over the last five years:

  • $1.86 per gallon in 2015
  • $2.92 per gallon in 2014
  • $2.97 per gallon in 2013
  • $3.03 per gallon in 2012
  • $2.95 per gallon in 2011

Areas nearby Billings and their current gas price climate:
Montana - $1.80 per gallon, down 2.3 cents per gallon from last week's $1.82 per gallon.
Idaho - $1.98 gallon, down 5.1 cents per gallon from last week's $2.03 per gallon.
Wyoming - $1.74 per gallon, down 4.5 cents per gallon from last week's $1.78 per gallon.

February looks to start the month with gasoline prices averaging under $1.80 per gallon, nationally, the lowest level since January 16, 2009," said Patrick DeHaan, GasBuddy.com senior petroleum analyst.

"... For now, due to a lag time from rising oil prices, gasoline prices in many areas may continue to drift lower, but don't be caught by surprise if in a few weeks they revert and move higher. Refiners have already begun some winter maintenance, and while supply of winter gasoline is abnormally high, once that inventory is liquidated, I fully expect gasoline prices to march higher," DeHaan said.