What are the disadvantages of turbojets?
Low Fuel Efficiency This higher fuel consumption results in increased operational costs and reduced overall efficiency. Despite these drawbacks, turbojets are still favored for applications where speed is a higher priority than fuel economy. Propeller engines are most efficient for low speeds, turbojet engines for high speeds, and turbofan engines between the two. Turbofans are the most efficient engines in the range of speeds from about 500 to 1,000 km/h (270 to 540 kn; 310 to 620 mph), the speed at which most commercial aircraft operate.