11. Combining Errands Combining several errands into one longer trip so your engine will stay warm. This helps you get things done and reduces traffic congestion and air pollution. Tips: 1. Keep a running list of the errands you need to do. 2. Group together items located near each other. 3. Plan ahead to give yourself enough time. 4. Think before you take off: Do I really need to make this trip? Can I combine it with another trip later? 5. Make sure your cloth bags are in the car