It may need some experimentation on your part to find out how your body reacts to endurance riding and how much effort you are putting in. I know when I do very fast long sportives ( 100 mile plus) and I am pushing hard all the way, my body refuses to take on solids after a while and I can only get down gels and liquids. Also our club run always stops at a cafe ( 60 -90 miles) . If I take on something like a giant sausage roll I really suffer on the way back, also most other guys on the club go for semething light, beans on toast etc. The club run inevitabely ends up in a fast run back.
My favourite at the moment is Nature Valley soft and chewy bars. I chop the top of the packets before I start to make it easy to get them out, not too dry so go down easy. I am not a great fan of the stop and eat then carry on scenario as I lose my rythm and start to cool down etc. If there is a feed station, jump off fill bottle and go!.
Depends on your style really if you are going steady a fry up can be nice!