Average gasoline prices in Billings fell 9.5 cents per gallon last week, averaging $3.08 per gallon Sunday, according to gasoline price website BillingsGasPrices.com.
The national average actually increased 2.4 cents per gallon in the past week to $3.25 per gallon.
Billings prices on Sunday were 17.8 cents per gallon higher than one year ago and are 35.8 cents per gallon lower than a month ago.
The national average dropped 4.1 cents per gallon last month and stands 20.9 cents per gallon higher than one year ago.
"Average gasoline prices are moving up as we enter the new year, a trend that has held since 2008," said GasBuddy.com senior petroleum analyst Patrick DeHaan. "The biggest problem with that trend holding true this year is that we're starting 2012 about 20 cents per gallon higher than 2011, breaking yet another high price record and setting up an ugly year for motorists," DeHaan said.