Pay attention to dashboard lights that warn of engine problems. Newer vehicles are equipped with onboard diagnostic equipment. When you call, you will be asked to provide the license plate number, the date, the time and the location where you saw the smoking vehicle. You do not have to give your name, and the call is free. Combine trips to minimize cold starts.
Most vehicle emissions occur when the engine and catalytic converter are cold.
Drive at fuel-saving, moderate speeds. Jack-rabbit acceleration uses more fuel than your engine can efficiently burn. Avoid excessive idling. Drive during off-peak hours to avoid congested traffic. Avoid highway construction projects and lines at drive-through windows.