I'm still kinda new to endurance running, so the best way to describe my nutrition plan is...in development. Increased running was the vehicle out of my fat stage 12 years ago, but it was still just a compliment to strength training and rec sports. I didn't really become a runner until 2016. I wasn't sure how I'd fail with my first attempt in 2016, but unlike most in here I was highly confident that I would. My goal for that cycle was to try and figure out where I screwed up then patch those holes the next time around.
I think I figured out most of my problems, but unfortunately I don't think I was successful with fueling. The changes I implemented (bigger breakfast + more liberal with chews + mid-run fruit) led to success on long training runs, but since long training runs are shorter than the real thing forecasting how it would translate had some leap of faith factored in. That leap of faith fell short. I felt the bonk coming on about when I usually finished a training run (19-20 miles) and progressed to full blown survivor mode within the next couple miles. I think my solution this time around (slow-acting carbs earlier in the race) is a good idea, but also think I'll benefit utilizing this fasted method too.
I am confident in my ability to get to mile 20-22 on track. I think my greatest hurdle is putting myself in position to have the energy to sustain the final 4-6 miles. I've had difficulty articulating to others here that I am much less confident in my chances of success at this distance than they are, but it looks like I finally figured out how to put words to it.
I'm a very strong runner in shorter races, but I'm still a work-in-process at distance.