What is the consequence of fuel contamination?

Fuel contamination can lead to reduced engine performance and potential damage because it introduces unwanted substances, such as water, dirt, or microbial growth, into the fuel system. Contaminated fuel can cause various issues, such as clogging filters, corroding engine components, and leading to incomplete combustion. These complications can diminish engine efficiency, increase wear and tear, and ultimately result in expensive repairs or failures.

In contrast, the other choices suggest positive outcomes that would not occur from contamination. For instance, increased efficiency and lengthened shelf life contradict the negative impact of contaminants, while lower fuel costs typically relate to pure and high-quality fuel sources, rather than contaminated fuel which can lead to higher overall maintenance and operational expenses.