As structure for a larger discussion on performance, adaptation, and energy needs, we tackle three myths about burning carbs and fats: that you only need to replace the carbs you burn on a ride, that burning fat on a ride helps you lose weight, and that total energy needs are as simple as converting bike kJ to calories and adding a calculated BMR. We also answer listener questions on efficiency, the origin of the 2000 calorie diet, where your workout carbs go, fueling for ultras, and more.