Mayor Rahm Emanuel says his parking meter settlement will net the city $20 million a year, but won't release his calculations. Chicago's Corporation Counsel Stephen Patton, World Business Chicago Vice-Chair Michael Sacks, Ald. Scott Waguespack (32nd) and DNAinfo contributor Mike Brockway join us on Chicago Tonight at 7:00 pm to discuss the mayor's figures, and whether this negotiation is good for the city.