Here is a good visual model.
http://www.thelssa.com/lssa/article/...t=sp_hydration
That website sells their own sports drink based upon that theory. However, when I compared Gatorade's original formula and theirs', Lucozade, that had nearly identical amounts of sodium and potassium per mL (0.483mg Na+ vs. 0.50mg Na+, 0.125mg K+ vs. 0.099mg K+).
Seems if they have the same product, stick with Gatorade, they have done their research as well.
BTW, Gatorade has 14g/240mL and Lucozade has 15.36g/240mL carbohydrates (sugar).