Why only 100-150 calories per hour? What kind of riding is the norm for your clients?

I tend to shoot for at least 200 per hour. Most of my rides under 90 min are intense interval workouts, but for chill rides, I guess I still take in 100-200 calories per hour because it's usually been a while since I ate a meal. Most of the food contains electrolytes, and I usually end all but recovery-type rides starving and, in the summer, craving salt. Even if I don't feel hungry, I will feel a bonk coming on (dizziness in the shower, etc.) if I do not get a full meal in soon afterward. I think if I could digest and use more calories during my rides, I'd consume them.