Doing full loads of laundry in the washer saves both energy and water. Sort and organize your laundry so that you will be doing full loads. Be careful not to overload the washer. Your clothes may not get fully clean and may need to be washed again. This is a waste of energy, water and time.
Many washing machines have settings for smaller loads that save energy and water.
Be sure to clean the lint from the dryer's filter after every load. The efficiency of the dryer goes down when lint collects over the dryer filter. Overloading uses excess energy because the items take longer to dry. Group similar types of fabrics together before drying them. For example, put towels together in one load.