DES MOINES, Iowa — Seven Midwest governors have sent a letter to the Environmental Protection Agency seeking regulation changes intended to increase sales of gasoline blended with a higher percentage of ethanol.

The governors of Iowa, Kansas, Minnesota, Missouri, Nebraska, North Dakota and South Dakota sent a letter Tuesday to EPA Administrator Gina McCarthy requesting new standards that would allow stations to sell more gasoline blended with 15 percent ethanol rather than the current standard of 10 percent ethanol.

The letter says the current setup “is stifling the widespread adoption” of E15 ethanol blends.

The governors — five Republicans and two Democrats — are all from leading ethanol-producing states. The letter was also sent to President Barack Obama.

A telephone message seeking a comment from McCarthy was not immediately returned Tuesday.