The article examines different types of hydrogen cars to see how they perform and affect the environment. They used computer models to compare how efficient and clean these cars are compared to regular ones. The study shows that adding electric power to cars makes them use less fuel, and hydrogen-powered cars can match regular gas cars when it comes to efficiency. It was found that certain types of driving conditions are best for these hybrid cars to work most efficiently. Hybrid hydrogen cars with electric power are better for saving fuel compared to just having a hydrogen fuel cell in the car.