The Why Gasoline Direct Injection is the Future of Fuel Efficiency self-paced course offers an in-depth exploration of Gasoline Direct Injection (GDI) technology and its critical role in advancing modern engine performance and fuel economy. Designed for automotive engineers, engine designers, and enthusiasts, this course explains the fundamentals of GDI systems, including precise fuel metering, high-pressure injection, and in-cylinder atomization. Learners will examine how GDI improves combustion efficiency, reduces fuel consumption, and lowers emissions compared to traditional port fuel injection. The course also addresses engineering challenges such as particulate emissions, injector fouling, and mitigation strategies. Through interactive lessons, case studies of modern GDI-equipped engines, and design optimization techniques, participants will gain the knowledge to understand, evaluate, and innovate with GDI technology—equipping them to contribute to cleaner, more efficient, and high-performance automotive solutions.