Actual prison exposure varies sharply by aggravating factor. Class 4 aggravated DUI: 1 to 3 years, often probation-eligible. Class 2 aggravated DUI: 3 to 7 years, with extended term to 14 years for prior felony history. Class 1 aggravated DUI causing death of one person: 3 to 14 years mandatory. Class X aggravated DUI causing multiple deaths: 6 to 30 years. Truth in Sentencing rules under 730 ILCS 5/3-6-3 require 85% of prison time actually served on DUI causing death. The chicagoduilawyer.net brand strategy on felony DUI is factually attacking every element that pushes classification upward before sentencing math locks in.
