You`re not comparing apples to apples. When you take ECA stack you`re taking the caffeine with the E. Other than that you can just take caffeine pills. I think 1 pill (200 mg) is the same as a cup of coffee.
I grind my own really fine and take two tablespoons of it and use only 8oz of water to brew it. My coffee would really be at least 3 tablespoons if it werent so finely ground. I drink one cup of really strong coffee in the late morning and sometimes when I'm leaving work to go to school in the evening. I have ADHD and most stimulants have an opposite effect on me. I find it easier to sit still and I'm able to concentrate much better, but no increased energy.