So, the Chick Fil A avocado lime ranch dressing is 310 calories a serving, while my version is 82 calories. But lets look beyond the calorie count for a moment. My homemade avocado lime ranch dressing is full of essential fats and nutrients. Avocados are a nutritional powerhouse packed with vitamins, fibre, and minerals. At the same time, lime juice provides the body with a good dose of Vitamin C. There is so much more to healthy eating than counting calories, but either way, this homemade avocado lime ranch dressing certainly is a healthier alternative to its fast food counterpart.