True or False: For the sake of recycling, you should mix old fuels with new fuels.

Mixing old fuels with new fuels is not recommended, and therefore the statement is false. Old fuel can deteriorate over time, leading to changes in its chemical composition, which can negatively affect the performance of an engine or machinery. Additionally, mixing old and new fuels may introduce contaminants that could create inefficiencies or cause damage. Proper disposal or recycling of old fuel is a better practice to ensure safety and environmental responsibility.

It's important to follow guidelines provided by manufacturers regarding fuel use, as they typically advise against mixing fuel types to maintain system integrity and optimal performance.