I never parted with a $20 bill faster. It happened at one of my favorite diners. The Western omelet and Diet Coke I often get wasn’t the $11 it had been for as long as I remember. It was $16. That expense, with my tip for the excellent waiter, consumed my entire $20 bill. I feel bad for the diner’s owner. He told me that soaring food costs have been killing his profits for months. He’s been fo…