Illinois gas station owners are speaking out against proposals for a fuel tax hike being floated in Springfield this year.  Retail gas station leaders will announce their opposition to such a plan at a news conference this afternoon in the state Capitol.  They say increasing the gas tax in a tough economy would hurt drivers and businesses owners.  Two weeks ago, a state transportation group unveiled their plan for funding road construction and public transit.  The Transportation for Illinois Coalition’s proposal included increasing the gas tax by 4 cents.  They also called for higher vehicle registration fees and ending the ethanol credit for gasoline.  Funding from the state’s five-year capital construction program is set to run out this year.  The state gas tax hasn’t been increased since 1990.