Actual ingredients list and Nutrition Facts of the Gatorade orange powder I recently purchased.
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Ingredients: Sugar, Dextrose, Citric Acid, Salt, Sodium Citrate, Monopotassium Phosphate, Modified Food Starch, Calcium Silicate, Natural Flavor, Yellow 6
Nutrition Facts: Serving size, "about 12 fl oz"; Calories, 80; sugars, 21 g; sodium 150 mg; potassium 50 mg
If we convert that to litres, then it's: 222 Kcal/litre, 58 g sugars per litre, 417.5 mg sodium per litre; 139.17 mg potassium per litre
I can't say what the recommended electrolyte replacement rate might be for your body and your hike,
but I can say that sugar is an essential nutrient for physical exertion, so the mere fact that Gatorade or any other product contains sugar is not a disqualification.