Mo. Rev. Stat. § 33.095: Mileage allowance, employees of state and certain counties.

Other provisions of law notwithstanding, in every instance where an officer or employee of the state or any county, except first class counties with a charter form of government, is paid a mileage allowance or reimbursement, the allowance or reimbursement shall be computed at the rate of ten cents per mile unless a higher rate is specifically authorized by statute or order of the commissioner of administration.