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DENVER (KDVR) — Gas prices continue to rise across the country. The national average for a gallon of gas rose above $4.00 on Monday morning.

According to AAA, the national average for a gallon of regular fuel is $4.06.

Here are the least expensive states for gas as of Monday morning at 8 a.m.:

  1. Missouri: $3.62
  2. Oklahoma: $3.64
  3. Kansas: $3.67
  4. Arkansas: $3.69
  5. South Dakota: $3.70
  6. Iowa: $3.71
  7. Texas: $3.72
  8. Nebraska: $3.73
  9. North Dakota: $3.73
  10. Wyoming: $3.74
State Regular Mid-Grade Premium Diesel 
Missouri$3.627$3.847$4.115$4.169
Oklahoma$3.646$3.906$4.132$4.158
Kansas$3.678$3.938$4.189$4.212
Arkansas$3.693$3.915$4.209$4.283
South Dakota$3.701$3.802$4.153$4.148
Iowa$3.719$3.837$4.287$4.312
Texas$3.726$3.977$4.284$4.362
Nebraska$3.731$3.821$4.201$4.246
North Dakota$3.732$3.942$4.204$4.193
Wyoming$3.744$3.956$4.201$4.273
Credit: AAA

Even though these states have the lowest average gas prices in the country, according to AAA, they have all seen a significant rise in prices week-to-week.

Here’s a look at how much prices have risen since last week, according to AAA:

  • Missouri: up $.30
  • Oklahoma: up $. 36
  • Kansas: up $.30
  • Arkansas: up $.46
  • South Dakota: up $.26
  • Iowa: up $.32
  • Texas: up $.44
  • Nebraska: up $.32
  • North Dakota: up $.33
  • Wyoming: up $.30

California is the most expensive state for gas with an average price of $5.34 per gallon.

In Colorado, the average price for a gallon of gas is $3.75.

The Associated Press said the all-time high for average gasoline prices was set in July 17, 2008, at $4.10 per gallon.