Yasky: Ouch. In fairness, though, Panera's nutrition facts assume that you don't tell them to hold the mayo. Otherwise, you can't explain why this sandwich:

99% fat-free smoked turkey breast, leaf lettuce, tomatoes and red onions with mayonnaise, spicy mustard, salt and pepper, all served on your favorite sandwich bread

contains 470 calories and 17 grams of fat. Mayonnaise is the only thing in that description that contains anything remotely close to 17 grams of fat.