You want to probably look out further than just your current ride day (before and during) to make sure you are fueling your ride. Your body does a superb job of trying to figure out what you are up to next, and if you are giving it a steady schedule of long rides, it's going to start anticipating them given the proper nutrition. To do this it needs the right ratio of carbs, protein and fats. What is that ratio? Everyone is different. The guidelines are usually 55 to 65% carbs, no greater than 30 to 35% protein and generically the rest is fat. My eating plan is usually 55 to 60% carbs, 28 to 30% protein and the rest fat. If you pick up any sports nutrition book it will somehow boil it down to this. The one I have is from a class I took and it's pretty useful. Or make an appointment with a dietician or sports med clinic to find out what is right for you. They are there to help you figure it out. Make sure you are taking in the right calories for what you are doing, and they should be able to help you with that as well.

You are doing endurance work which requires the body to hit up fat stores and in order to do that it needs carbs to burn it. If it can't unlock the fat stores with the proper carb fueling, it's gonna give you the out of gas feeling.

If Gatorade is too much, water it down. Everyone is very different, some people can drink while some people prefer to eat. I prefer to hit old Halloween and Easter candy. It works for me, and it's about the only time I can stomach something that sweet! Go figure...