More free grub! Taco Bell is promoting their Drive-Thru Diet Menu with a coupon for a free Fresco Taco. You get your choice of Beef, Chicken, or Steak Taco. Taco Bell and "diet" in one sentence? I guess so. The beef, chicken and steak tacos each weigh in at 180 calories or less and 7 grams of fat or less. Coupon expires next Thursday, Feb. 18. Click here to print.