Wis. Stat. § 100.265

No later than December 31 annually, and at such other times as the department determines to be necessary, the department shall publish and transmit to the department of administration a list of all refueling facilities in the state at which gasohol, as defined in s. 16.045 (1) (d), or any alternative fuel, as defined in s. 16.045 (1) (b), is available. The list shall be organized by location and shall indicate which facilities are open to the public, which types of fuel are available at the facilities and which facilities are limited to use by certain employees or types of vehicles, and shall identify the employees or types of vehicles to which such use is limited.