Which of the following is a consequence of having clogged fuel injectors?

Having clogged fuel injectors leads to reduced engine performance, which is the correct answer to this question. Clogged injectors disrupt the proper flow of fuel into the engine, leading to an uneven mixture of fuel and air. This fuel-air mixture is crucial for optimal combustion, which in turn determines how efficiently the engine operates. When injectors are unable to deliver the right amount of fuel, the engine may experience issues such as misfires, rough idling, and a drop in power output.

In contrast, the other options do not hold true in the context of clogged injectors. For instance, increased fuel efficiency typically results from smooth and optimal fuel delivery, which is not possible with clogged injectors. Additionally, engine operation may become rough and louder due to misfiring, rather than quieter. Lastly, the aircraft's range is likely to be compromised since reduced engine performance can prevent the engine from generating sufficient thrust, which is necessary for achieving optimal flight conditions and distance. Thus, the ramifications of clogged fuel injectors primarily center around a decline in engine performance and efficiency.