human
What should I do to make my car more fuel-efficient?
assistant
You can start by reducing your vehicle's drag coefficient. This can be done by making sure you have a clean and aerodynamic exterior, such as using low-profile tires and removing any extra weight from the car. Additionally, you may want to consider switching to an alternate fuel source such as ethanol or biodiesel, which are both more efficient than traditional fuels. Finally, you can try to reduce engine idling, which is one of the biggest contributors to fuel consumption.