This week on The Best of Car Talk, is the phrase, "Yes, dear," the key to a happy marriage--even if it's delivered with a smirk? The saga of one of Ray's most annoying purchases helps illustrate. In matters automotive, retired math teacher Angelina can't find a formula to back up her husband's claim that bigger tires will improve their Civic's gas mileage. Also, Tom and Ray are guaranteed to diagnose why Leland's Toyota can't pull a hill, if they can figure out what "pull a hill" means; and Tom seizes on one of his most brilliant/wacko/unencumbered-by-the-thought-process explanations for Kim's overheating engine. All this and more this week on the Best of Car Talk.