A study on the gap between the certified fuel efficiency and real driving fuel efficiency

Abstract

: Drivers have expressed their disappointment with the differences between certified fuel efficiency and real driving fuel efficiency. The extent of the gap between the two types of fuel efficiency has been reported mainly from Europe, so it is necessary to study the gap between the fuel efficiency and certified fuel efficiency of Korean drivers. Therefore, this study recruited Korean drivers and obtained their driving data from the same OBD II terminal. We selected one gasoline vehicle and one diesel vehicle with a large number of drivers and examined the differences among the 4 representative values of the actual fuel efficiency of the driver and the 2016 certified fuel efficiency. The 4 representative values of the actual fuel efficiency of the driver are defined as arithmetic mean, harmonic mean, median value, and mode value according to the statistical method. As a result, certified fuel efficiency is better than the actual fuel efficiency. In the future, we will analyze the gap based on the number of vehicles and different driving conditions. Copyright 2019 KSAE