MOM Tip: Here’s an energy-saving laundry tip for you: Placing a dry towel in the clothes dryer with a load of wet laundry reduces drying time, cutting down on energy usage and utility bills. The idea is that by adding a dry and absorbent material, some of the moisture from the wet fabrics is wicked away by the dry towel. This reduces the moisture inside the dryer, allowing each item to dry out more quickly
This tip from eHow.