You don't need extra fuel to run 15, 20 or even 26 miles. I once did 31 miles up and down a 6 mile hill in Sardinia with no special breakfast or gels or sweets. You need more slow miles in your legs to train your body to use the fuel it has more efficiently.
SIS IsoGels are pretty good - they've got a runny, watery texture and quite a mild taste. If they're still a bit much, maybe Jelly Babies?
You need to try different things and see what works for you.
I use lucozade sport and jelly babies for long runs. I find "little and often" works best for me, so I'll take a mouthfull of lucozade every half mile or so and a jelly baby every other mile.
Also - have you tried getting up at 5am, eating breakfast and then going back to bed?
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