If you believe Asker Jeukendrup's work, a 2:1 ratio of glucose:fructose (found in gels such as Gu and Powerbar) improve performance over plain glucose/maltodextrin.
I, personally, (and many others I know) do not stomach fructose well. But if I could, I'd definitely use a 2:1 ratio gel.
I, personally, (and many others I know) do not stomach fructose well. But if I could, I'd definitely use a 2:1 ratio gel.