Abstract
The website “e-nenpi”, which means good fuel economy in Japanese, helps users to monitor the fuel economy of their cars by accessing internet from their mobile phones at gas station. Over 6 million real fuel economy data from 2000 were stocked in the “e-nenpi” database. From the analysis of those data, 22% improvement of fuel economy from 2001 to 2009 was found, and we could divide the contribution of the improvement which are about 10% of vehicle factors like weight reduction and fuel economy improvement technologies, and about 11% of the other factors like eco-drive and reduction of congestion, and so on, which are responsible for autonomy On the other hand, “e-nenpi” user’s driving style include eco-drive were surveyed, and combined with their real fuel economy data. Relationship between driving style and real fuel economy were analyzed. As results, effective eco-drive items and key points to improve fuel economy were found. We also analyzed the structure of real fuel economy by using structural equation models (SEM) to make clear the contribution of vehicle weight, congestion, daily drive distance, and eco-drive to improve real fuel economy.
Keywords: Fuel Economy, Passenger Car, Modeling, Eco-drive, Field Data