I love a good rut. I probably ordered a "dress one side" from Juniors a couple hundred times in college ($2.63 for a hamburger, a giant mound of fries, and a coke -- refills $0.25 and $0.25 for a chocolate chip cookie).
The rut of the day is slightly healthier: 8 miles and oatmeal. I've run the same route at work 10 times in the last month and have worked my way down from 1:18 to 1:08 (admittedly at a higher heart rate) and it feels great. I get back, stretch, take a shower, and pop in the cafeteria for a cup of oatmeal. At $1.44, it brings me back to Junior's.