imo, carrying substantial amount of food/gels/powders negates the advantage it would give. you'll need to carry it up every hill - is it worth it? i hope (and anciens say) there will be a lot of food options along the way, so if i stop for some, i'll get some extra to carry and eat while riding. i'll take 20 small flapjacks and few energy gels for emergency use, also a tube of high5 zero tablets. tbh, food management is still a bit of a mistery for me on long rides. i know i can rely on muffins, cake, flapjacks and tea in uk to get me through a day or two of riding. can i expect similar "energy" food in france?