The U.S. national average for a gallon of unleaded gasoline jumped 5.4 cents over the past week, reaching a level it had not seen in ten weeks.

Although still more than a dollar cheaper than it was a year ago, the Energy Department reported that gas is now selling for $1.89 a gallon on average across the country.

The most expensive region is the West Coast which is averaging $2.08 a gallon. The cheapest area of the country is the Rocky Mountain states which have a regional average price of $1.71, though it suffered a jump of 6.8 cents in the past week.

San Francisco had the highest city price at $2.10, up 3.1 cents in the last week. Houston had the cheapest gas prices at $1.75 per gallon, even with a jump of 6.7 cents in the last week, according to the Energy Information Administration’s weekly gas survey report.