Nissan said that based on its own tests it estimates the gauge could cut fuel consumption by an average 10 percent as drivers improve their "eco-driving habits" in response to the real-time gauge readings.

The automaker introduced a similar service in January through its Carwings navigation system for certain models.

All rights reserved. � 2005 Agence France-Presse. Sections of the information displayed on this page (dispatches, photographs, logos) are protected by intellectual property rights owned by Agence France-Presse. As a consequence, you may not copy, reproduce, modify, transmit, publish, display or in any way commercially exploit any of the content of this section without the prior written consent of Agence France-Presse.