Fuelling multi-day riding (carb loading/replacement) Carb loading (cycling weekly)  is reckoned to be useful for exercise over about 90 minutes, so is probably a good idea for all-day riding.  Done properly you're taking on extra carbs starting 36--48 hours before the event.

I've seen some advice online but it's all from gel/energy drink manufacturers, so biased towards their products and away from proper food.

So: How does this translate to multi-day riding? Or in more detail:


Is it as simple as starting loading 48 hours before the first leg, and taking on as much as you can during/between the rides? 
Should you start fuelling earlier in the first leg than you would if the next day was a rest day? 
Should dinner in between be heavy on the carbs to partially refuel, or contain plenty of protein for recovery?  
Is it very different to fuelling the same distance in a single ride




Example (though the question is meant to be a general one):

For rides of a century (160&nbsp;km) or more I attempt to do it properly rather than just scoffing a big plate of pasta the night before.  For shorter (e.g. 100&nbsp;km) rides I might or might not bother.  A week from now I've got a 100&nbsp;km ride on the Saturday afternoon followed by 200&nbsp;km on the Sunday.  I'm not planning to set any PRs and it's not going to be hilly but for the first and last 100&nbsp;km I'll be loaded for camping, so I reckon on 5--6 hours door-to-door the first day and 11-12 the second.  I have a reasonable tolerance for gels, but get on better mixing them with real food.



A couple of related questions:


Eating during a 170 mile ride
Food for 400+km ride? (in single session) [closed]
Summing up the comments, advice received elsewhere, and experience having tried it:


Hydration is just as important.  You don't want to start the second day even slightly dehyrated (which you wouldn't notice sat at a desk, so may nopt be expecting if you're used to single-day rides).  Start rehydrating as soon as you finish the first ride, even if you think you don't need it.
A proper dinner on the night in between rides (carbs and protein) and a proper breakfast (carbs).  If you're starting a hard effort early, you may have your own approach to breakfast.
Do try to keep carbs topped up on the first day, whether this is by proper food or gels.  The choice is likely to be a matter of preference and ride type.
Carry more gels/sweets/energy drink than you think you'll need on the second day, and/or be prepared to stop and buy something.