The book details the classification of solid, liquid, and gaseous fuels, their calorific values (HCV and LCV), petroleum refining, and knocking in engines (Octane and Cetane ratings).
Don't just read the theory. Practice the problems on Hardness, Alkalinity, and Combustion. These are high-scoring sections in university exams.
The inclusion of chemistry in the engineering curriculum is deliberate and strategic. Engineers are essentially problem solvers who utilize materials to build the infrastructure of modern society. Whether it is civil engineering, where the chemistry of cement and concrete determines structural integrity, or mechanical engineering, where lubricants and corrosion resistance are paramount, chemistry is ubiquitous.