Wisconsin's aviation fuel tax is 6 cents per gallon.
Want to save even more $ by burning mogas you say?.....
Can you hold 100 gallons? Got a buddy you can split 100 gallons with?

Many small aircraft have been approved by the FAA to use
the same unleaded gasoline that is placed in the family car.

Under Wisconsin law, general aviation fuel dealers can

purchase automobile gasoline from fuel suppliers for aircraft

use without paying the Wisconsin motor vehicle fuel tax

(currently 30.9¢ per gallon). Fuel users (see Part II) can also

purchase automobile gasoline tax-exempt for aircraft use by

obtaining an aviation fuel license.

In order to purchase automobile gasoline tax-exempt from

fuel suppliers, general aviation licensees must give suppliers

a Certificate of Fuel Tax Exemption (MF-209). Blank forms

can be obtained by calling the department at (608) 266-3223.

In addition, gasoline purchased tax-exempt for aircraft use

must be delivered to the general aviation licensee’s storage

tank in an amount not less than 100 gallons.