On average, the cheapest gallon of regular gasoline in the United States this Monday morning costs $2.389, and it is available in St. Louis. A month ago that gallon of gasoline cost $2.809 on average in St. Louis, according to GasBuddy. If the price falls that much again ($0.42 a gallon), a gallon of gasoline in St. Louis will cost less than $2.00 on New Year’s Day — $1.969 to be exact.

In fact, by New Year’s Day a gallon of gasoline could cost less than $2.00 a gallon throughout the entire state of Missouri, one of eight states we identified as most likely to see gasoline prices fall below $2.00 a gallon as early as the beginning of 2015.

The 15 cities where the average price of a gallon of gas is now less than $2.50 are:

• St. Louis, Mo., $2.389
• Lubbock, Texas, $2.402
• Amarillo, Texas, $2.421
• Santa Fe, N.M., $2.423
• Albuquerque, N.M., $2.442
• Spartanburg, S.C., $2.443
• Sioux Falls, S.D., $2.463
• Oklahoma, City, Okla., $2.463
• Kansas City, Mo., $2.468
• Chattanooga, Tenn., $2.471
• Greenville, S.C., $2.480
• El Paso, Texas, $2.481
• Myrtle Beach, S.C., $2.482
• Fort Worth, Texas, $2.486
• Dallas, Texas, $2.497

Only one state, Missouri, boasts an average price below $2.50 a gallon, but Oklahoma, South Carolina, Mississippi and Texas are close, ranging from $2.511 to $2.529.

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