What effect does aviation gasoline mixed with jet fuel have on a turbine engine?

The mixing of aviation gasoline (AVGAS) with jet fuel can lead to the formation of deposits on the turbine blades of a jet engine. This occurs because the chemical composition of AVGAS is different from that of jet fuel, and when mixed, it can create byproducts that do not combust efficiently in a turbine engine. These byproducts can settle on the turbine blades, leading to increased fouling and potential performance issues.

The presence of these deposits can lead to a reduction in airflow over the blades, thereby impacting the engine's efficiency and increasing maintenance requirements. Accumulated deposits can also disrupt the uniformity of the combustion process, potentially leading to engine performance degradation over time.

This outcome stands in contrast to the notions of increasing engine efficiency, having no effect, or reducing power output, as deposits fundamentally interfere with optimal engine performance by changing how the engine operates and leading to higher operational risks.