INQUIRER: “Philadelphians are the most generous tippers in the nation,” according to a news release from Zagat, announcing the official publication today of its 2009 guide to Philadelphia area restaurants. According to Zagat — or at least the 5,507 local diners who reported on their preferences and habits to Zagat — people in the Philadelphia area leave an average tip of 19.6 percent. New Yorkers leave 19 percent — the national average — while folks in L.A. leave 18.4. MORE