blog posts Economists: Pros, cons to raising the gas tax in Illinois Apr 20, 2015 2:15 pm by Phil CicioraResearch Share on Facebook Tweet Email Images After the precipitous drop in crude oil prices over the past nine months, some policymakers in Illinois have advocated raising the state’s excise tax on gasoline, which has remained unchanged at 19 cents per gallon since 1990. Share on Facebook Tweet Email