This.You can get better at burning fat for energy.
You have to deprive it of it's other source.
Some people do better on carbs.
If you do better on fat you think everyone should do it.
The key is to try and see.
And it’s hilarious to listen to a person who’s never competed in any sort of endurance race tell me about how I should eat to optimize my endurance performance.
I figured what works best for me through years of experience and experimentation.