• Bookstore

The fuel efficiency gauge will also be equipped in current models scheduled for minor product freshenings.

The gauge provides the driver with both instant fuel-efficiency and average efficiency readings. For example, by accelerating, the driver would instantly see an increase in fuel consumption reflected on the gauge. Based on Nissan's trials, drivers have tended to improve their eco-driving habits over time, prompted by the real-time fuel-efficiency readings. Driving improvements also included smoother acceleration and braking, which potentially could lead to an average 10% improvement in fuel-efficiency.

The phenomenon of improved fuel-efficiency with real-time read-outs has long been seen among Prius drivers who already have the gauge fitted in their cars.  Many have become so obsessed with beating the manufacturer's stated MPG that a self-named group of 'hypermilers' has emerged.  Hypermilers can be found sharing their experiences and tips on their blog www.cleanmpg.com.

Expect to see real-time gauges popping up in all walks of life.  The Government are investigating the use of "smart meters" in the home.  With smart meters you receive a real-time indication of the amount of electricity and CO2 you are producing when you have various appliances or TVs etc on in the house.  It has also been shown that people with water meters use less water than those without.