i recently read an article in runners worlds most recent magazine that explained how 2 olympic marathoners trained for London by doing their runs when there "tank" was on E. the article explains that when your tank is on E and go out for a run that your body adapts to burning carbohydrates more efficiently and more relies on fat than carbs. these 2 athletes ended up PR'ing also in the olympic trials. So i was wondering if cycling works the same way? that if you cycle when your tank is on E then your body will learn to burn carbs more efficiently and rely on burning fat instead and also making you have some of the best race times you've ever had?