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@pastry_lover
Also bolleques. I can't find the studies I was reading the other day but from memory:
A drink containing 6% carbohydrate (glucose only) was found to be optimal for absorption during exercise, while a 9% glucose drink empties from the stomach slower than a 6% solution - both irrespective of electrolyte content. The 3% glucose drink emptied from the stomach at a similar rate to the 6% drink. Will post the link later when I find it on http://www.ncbi.nlm.nih.gov/pubmed
However, mixing glucose and fructose in a 2:1 ratio, you can safely make a 9% carb solutuon in a drink; IIRC this will be absorbed just as fast as a 6% glucose only drink. One study found that "ingestion of a combined GLU+FRU solution increases gastric emptying and "fluid delivery" compared with a glucose only solution" http://www.ncbi.nlm.nih.gov/pubmed/19000102 - however this study http://www.ncbi.nlm.nih.gov/pubmed/19127189 finds no benefit of glucose + fructose compared to glucose alone.
I wouldn't call 6% or 9% 'extremely diluted'