Gas station owners are worried that lawmakers will pass an increase to the motor fuel tax to bring in more revenue.
David Smith owns gas stations along the Illinois border. He says Illinois' higher taxes cause most drivers to fill up outside of the state.
"At one of our Missouri stations near the border of Missouri and Illinois, we sell for example 170,000 gallons of gas per month," Smith said. "However at our Illinois-based border station just a few miles away on the Illinois side, we only sell about 70,000 gallons per month."