What is the drawback of using air as a fuel in vehicle?

Using air as a fuel in vehicles faces significant drawbacks, primarily because air itself is not a fuel but rather an oxidizer, essential for combustion. Vehicles require a substantial energy source to power their engines, and air cannot provide that energy. Additionally, while technologies like compressed air might offer some benefits, they typically result in lower efficiency, limited range, and require complex systems to compress and store the air, making them less practical compared to traditional fuels or electric power.