Then, declutter your car! Heavier vehicles require more energy to move, so carrying around excess weight will also affect your fuel economy. Did you know that an extra 100 pounds in your vehicle could reduce your gas mileage by up to 2 percent? If you have a roof rack or roof carrier, install it on your vehicle only when necessary. The same goes for bike racks. Racks and carriers add extra weight, AND they increase the aerodynamic drag on the vehicle, further decreasing your fuel economy.
So, declutter your car, improve fuel economy, and save money!