Fuel Consumption vs Propulsion Performance Monitoring

There is quite a lot confusion about Fuel Consumption Monitoring and Propulsion Performance Monitoring, and even more regarding Propulsion Performance per se. The present article is just meant to give few pointers and clarifications regarding the above. Some comments are "tongue in cheek", I hope the readers will not mind... but the article is not a joke, quite the contrary.

First and foremost, fuel is burnt to convert chemical power into thermal power and thermal power into mechanical power.