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Yeah the last sentence.
Just concentrate on one really
I do like doing 4h rides, where I fuel but not quite enough. Then come the last hour, I'll do a 20-40 min effort at about all I can manage. Until I bonk. Then I'll ride home for whatever it takes totally depleted. There good.
But if your doing short turbo rides, just fuel up and train hard. Training hard does not mean your body isn't becoming better at burning fat.
What are you trying to achieve by these double sessions?