We start the week with regular gas prices leaning hard on the $4 line. An internet gas-price site shows three stations in St. Louis selling regular at $3.99 a gallon.

The cheapest regular self-serve is at three stations in Jackson, in southeast Missouri, where the price is reported at $3.47. Another station in Jackson has it at $3.49.

Diesel fuel is well past $4 in many places, topping out at $4.27 in Cuba, on Interstate 44. It’s $4.19 a gallon in the St. Louis suburb of Overland. Cheapest diesel fuel we’ve seen is at Poplar Bluff, where a station has it for $3.75 a gallon.