Yes, I use a mix of Maltrodextrin 35g, Fructose 10g (Optional), Vanilla Whey protein 10g, tsp Salt and a little Energade for Flavour to a bottle, done an IronMan on the mix. Maltrodextrin is a pure complex carb with a low GI, you can work on 4Cal to 1gram Maltrodextrin. Mix is very cheap as 2 Kg Maltrodextrin is approx R30. Was a great fan of GU2O, but as Maltrodextrin is the main ingredient, didn't feel much difference... Warwick