Regular gasoline rose five cents per gallon on average in the U.S. over the past two weeks to reach a price of $3.56.

A survey released Sunday by industry analyst Trilby Lundberg reveals prices have risen 26 cents per gallon over the past six weeks, representing a $4 bump on a typical gas tank.

Midgrade costs $3.74 per gallon on average with premium gas at $3.89 and diesel at $4.02.

Within the contiguous U.S., Los Angeles has the highest average price at $4 per gallon, while Billings, Mont., comes in lowest at $3.18.

Write to Charlie Campbell at charlie.campbell@time.com.