I eat a good carb loaded but not too much the night before, in the am I try not to bolus unless I am super high, I want my bg around 200 before start, I disconnect from my pump for half marathons and shorter, I usually have a gu gel around mile 5.5 and then another around the 10 mi mark if I feel like I need it, this works for me and my bg is usually under 100 when I am done.
