Trying to turn an advertising error into a consumer-fraud case, Carla Burkhart sued Wolf Motors of Naperville alleging the dealer violated the Illinois Consumer Fraud and Deceptive Business Practices Act when it refused sell her a used 2011 Toyota 4Runner for the advertised price of $19,991.Burkhart took a test drive and declared she was accepting the dealer’s alleged offer to sell the vehicle for $19,991. But the salesperson told her the published price was a mistake; it was supposed to be $36,991. Insisting she had …