Denver Mayor Mike Johnston wants to add a 20% service charge to local restaurant tabs — and then tax it — to help restaurants cope with the city’s minimum wage and promote what he called pay equity among tipped and non-tipped employees. On Monday, Johnston told City Cast Denver, a popular podcast, that he has already been discussing the idea with restaurant owners. He didn’t say whether they are on board. He also did not discuss if increasing people's dinner costs would decrease restaurant visits. Johnston has incurred the ire of some local restauranteurs, who this month penned a letter...