Answer:
In the State of Illinois there is no right of rescission when purchasing a vehicle from an automobile dealership, IF you take delivery at the dealership or at the dealership's special event location. There is some question whether there is ever a three day right of rescission for motor vehicle sales.
The Colorado Department of Revenue, Motor Vehicles Division, Dealer Licensing Board may have consumer information that is the most current status of consumer rights. Another good resource is the Colorado Attorney General's Consumer Affairs office.