Posted: 19/04/2014 at 16:12
Sorry to hear that DT19.
I firmly believe that it's very possible to run good marathons without any help at all. TippTopp over on the sub 3 forum runs 2:27 on just water! A very good lady marathoner from my club (2:39) only takes occasional sips of sports drink.
I'm not brave enough to do it yet, but plan to slowly reduce the amount I take in. I've had a horrible last 6 miles twice in marathons, and both times were down to pacing and/or overestimating my fitness, not nutrition.