Okla. Stat. tit. 68 § 707
In the event the tax herein imposed on special fuels imported into this state in the fuel supply tanks of motor vehicles and the tax on special fuels used in motor vehicles owned and operated by licensed special fuel dealers or other persons acting as special fuel users can be more accurately determined on a mileage basis, that is, by determining and using the total number of miles traveled in Oklahoma and the total gallons of fuel consumed, or in case it is more practicable to so determine the tax, the Tax Commission is authorized to approve and accept such basis.
No city, town, county or other subdivision of the state shall levy or collect any excise tax to be paid upon the use of special fuels as defined by this act.
Okla. Stat. tit. 68, § 707