Name one factor that affects fuel quality.

Temperature fluctuations significantly impact fuel quality because they can lead to changes in the physical and chemical properties of fuel. For instance, when fuel is subjected to higher temperatures, it may expand and vaporize, which can lead to an increase in fuel vapor pressure. This vaporization can cause issues such as the formation of vapor lock in engines and can reduce the density and energy content of the fuel being dispensed. Additionally, temperature changes can impact the solubility of certain fuel components, which may lead to contamination or degradation of the fuel over time. Thus, managing temperature is crucial for maintaining high fuel quality at gas stations.