For transport service purchasers, cost transparency is becoming increasingly important to negotiate more effectively with service providers and to better identify potential savings. The book by Prof. Dr. Paul Wittenbrink provides an excellent and comprehensive foundation for this purpose. In addition to the well-presented methodological fundamentals of vehicle cost accounting and its strong practical relevance, the book stands out for its many concrete approaches to cost savings. It is also positive that the author dedicates a special chapter to the increasingly important topic of Green Logistics, as many fuel-saving strategies also automatically lead to CO2 reduction.