I've used 80% maltodextrin i.e. glucose polymer and 20% fructose for a number of years. I find any more fructose than this too be too sweet for my tastes. Straight up sucrose is also over the top sweetness wise for me as well. I typically go with 8 grams of sodium/liter in the mix. I use this mix for marathon canoe races at concentrations for 10 to 15% depending on ambient temperatures.

YMMV,

Hugh

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Genetics load the gun, lifestyle pulls the trigger.