Perfect, if you are powering specific lab engines. Not perfect if you are powering an animal. Can someone explain to me where the confusion is here?

To explain further, since further explanation is obviously needed: There is the physical calorie, which is ONE THING, and then there is the vernacular, "nutritional" calorie", which is something ordinary people deal with day-by-day. They are VERY different, in that kerosene calories and celery calories are handled differently by the human body.

Again, very simple until it comes up against people who don't interact often with reality.