Interesting to see that fuelling seems to consist of long intervals between substantial feeds. Has no-one tried what we old boys used to do, porridge or chicken and rice (or both) about 2 hours before the off, several coffees and a sweet snack at 15 minutes to go, then start eating from about 30 minutes in, and keep the drinks going to stay hydrated. Food before the advent of gels could be banana, little sandwiches of honey rolled into mini-swiss rolls, sultanas, and then something a bit heavier in the musette at feeds. Plus little cans of coke, to keep the energy high, and bits of chocolate bars, cereal bars, all in foil. In the context of a long steady ride, the "race feed" point would be where you might have a feed/café stop and load up a bit. Just don't overdo it as a very full stomach feels horrible and there's always a tidy little climb whenever that happens!
Really important to have a post ride/race bit of protein to start repair and recovery, and something sweet to top up energy immediately (usually coke), and of course never let yourself get thirsty. It still all works even in the days of gels and other "fuel". Personally I'm not keen on gels, have had a few unpleasant stomachs on them so stay away from them.