Tue Apr 14,2015 2:00 am

Publication of e-Denpi Report 2014-15

IID, Inc.
April 13, 2015
IID, Inc.

■Publication of e-Denpi Report 2014-15

Published: Results of study on actual use of electric vehicles, based on driving data from owners of Nissan Leafs throughout Japan11

IID announced to the public e-Denpi Report 2014-15, a report compiled with the cooperation of Nissan Leaf owners from throughout Japan enrolled via the car fuel-economy management service e-Nenpi ( ) and the largest general automobile news site in Japan, Response ( ).

The Japanese term nenpi means “fuel consumption”, while the term denpi means “power consumption.”
For the e-Denpi study, drivers attached the OBD II cable of their car to a dedicated communications terminal from the Japanese firm HKS Co., Ltd., which in turn is linkable with the smartphone application e-Denpi App. When the smartphone application is on, more than ten different parameters, such as residual battery charge and power recovery ratio, are shown on the screen in real time. After any personal information had been removed, the data was uploaded to the cloud, and the trip data and power-consumption log data were then analyzed to prepare the present report.

A summary version of the e-Denpi report, containing an outline of the results and a summary of the constituent data, is available free of charge. The complete version, containing the raw data and a detailed report (approx. 100 pages), is available for $ 5,000 plus tax. The summary version can be requested by going to
and registering one’s affiliation and contact information.

The next study is planned for September 2015.

■Overview of the study
Purpose: To collect data for research into the next generation of EV development and driving methods
Subjects: Nissan Leaf owners (43 in total) who, in response to an announcement, submitted applications to be e-Denpi monitors
Period of study: September 4 - December 9, 2014
Data collection method: From a communications terminal attached to the OBD II cable of the car were obtained more than ten real-time driving parameters, such as residual battery charge and power recovery ratio, as well as electrical-current log information.
Volume of data collected: 3,350 trips

Overview of the results
・Comparing earlier models to later models, the power consumption of earlier models was higher.
•When it came to achieving the car’s rated range, i.e., the distance that can be driven on a full charge, earlier models averaged 107.8% of the rated range, while later models were also high at 89.6%.
・Breaking down the results by region, the power consumption rate was seen to be lowest in Shikoku, highest in Tokai.
・By age, the consumption rate was lowest for drivers in its 30s, highest for those in their 50s.
・By time of year, the consumption rate was lowest in September, highest in December.
・Average power consumption was highest in the case of average vehicle speeds below 10 km/h and lowest for average speeds in the range of 35-40 km/h, with the rate of consumption rising again at higher speeds.
・A greater number of sudden starts led to higher power consumption.

■About e-Nenpi
e-Nenpi is a service that permits drivers to register from their mobile or smartphone and enjoy managing their car online economically and ecologically. The service provides a wide variety of content, such as calculation of actual fuel consumption, information on gas stations throughout Japan, and reviews by users.
e-Nenpi also provides a search engine for EV charging stations and hosts a public database of hydrogen stations for fuel-cell vehicles throughout Japan.
e-Nenpi is dedicated to supporting environmentally friendly driving.

For questions regarding the e-Denpi report:
Masayoshi Ishihara, e-Nenpi Service G, IID, Inc.

For PR questions regarding IID:
Honami Watanabe, PR Officer, IID, Inc.