So you don't get the performance from the octane, it comes from the engine, which now requires a harder to ignite fuel. Example: My GTI requires 91. If I use 87, it senses ignition and retards the timing, and that's what makes it slower.
On average females can have 3-4 servings of carbs for each meal, and a serving of carbs in between meals. A serving of carbohydrates is 15 grams of carbs. On average, a male can have 5-6 servings of carbs for each meal and a serving of carb in between each meal. Remember, though, that the type of carb matters to. As a diabetic, you should choose carbs that are whole grains.
So, someone with diabetes needs to control how much carbohydrate he or she eats. Sugar is just one type of carbohydrate; foods contain other sources of carbohydrate, too, like starch. If you only account for the sugar in foods, you'll miss out on other sources of carb, and that can affect your blood glucose. In general, most people aim for between 30 and 60 grams of carbohydrate per meal, and 15 to 30 grams of carb per snack. It's a good idea to meet with a dietitian to find out how much carb is best for you.