Motorists lined up outside the Mount View Mobil Station in Rib Mountain, to buy $1.84 a gallon gas.
It was part of an event put on by Americans For Prosperity-Wisconsin.
Wisconsin State Director, Luke Hilgemann said, "We are here from 11-3 offering cheap gas. We pay the difference in the cost.
It is a great way to draw attention to the failed economic policies of President Obama. In 2009, gas cost just $1.84."
But some call the event a gas for votes scheme.
We Are Wisconsin filed a complaint with the Wisconsin Government Accountability Board to investigate whether the event violated state elections laws. Executive Director, Kristen Crowell said, " We believe they violated the law by giving away something of more than $1 as Wisconsin law states."
The GAB has announced no official ruling on the gas event.
The Marathon County Sheriff's Department added extra patrols in the area to avoid traffic snarls.
The gas station is located near north and southbound highway access points and busy Rib Mountain Drive.