50% less fat and 40% fewer calories than regular mayo. See nutrition information for fat content. From your friends at Whataburger. If you're one of those folks that never, ever holds the mayo, we've got you covered. Made with care for Whataburger. For questions & comments, please call 1-855-927-3824. Per Serving: This Product: 5 g fat; 60 calories. Mayonnaise: 11 g fat; 100 calories.