At Fast Trax we suggest you apply Dr Trent Stellingwerff's Rule of 15 to your race nutrition needs with 15 grams of carbohydrates every 15 minutes with 150ml of fluids.
Recent study's have shown a significant positive correlation between higher CHO intake rates and faster finishing times in marathon races. Thus, we suggest half marathon and marathon runners alike attempted to maximize their fuelling and hydration plan by consuming ~15 g CHO in ~150 ml of fluids every ~15 min during the race.
Marathon performance is influenced by dedication to handle training loads in an intelligent program. However, a well practiced marathon nutrition plan can certainly facilitate the quest for marathon success which is why we suggest practicing your race day nutrition on each of your half marathon and marathon specific simulation runs.