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.
The following are the six groups of the Diabetic Exchange Lists: Starches List (Includes breads, cereals, grains and starchy vegetables). One exchange from this group has 15 grams of carbohydrates, 3 grams of protein, and 0-1g of fat for a total of 80 calories per serving.