Everyone is different, but that does seem like a lot of food. I also carefully plan my pre-ride dinner and breakfast for long rides (above 40 miles). My breakfast always includes 2 eggs, fruit, and a whole wheat bagel, or a slice of toast. On rides, I eat Lara Bars and supplement with Shot Blocks. That's all. If my energy is lagging, a Shot Block really helps me on long rides. If there's a lunch stop, I find it hard to eat, so I choose carefully. If I bring a lunch. it's a whole wheat bagel with almond butter and sometimes jelly.
I often am ravenous after a long ride. I eat a carb/protein snack within an hour, and then try to wait until dinner. I usually can't, so I do snack a bit more on salty and healthy carbs; cheese and crackers usually does it.