Use a push mower to mow the lawn instead of a gas or electric mower. Rather than driving your car to work every day, use public transportation, carpool, ride a bicycle or walk. Improve the gas mileage of your automobile by performing regular maintenance, checking and replacing the air filter regularly and keeping the tires well inflated. Excess weight in a vehicle can affect the gas mileage, so unload unnecessary items from the trunk and remove roof racks when not in use.