Abstract
Firstly, we proposed the methods to evaluate the changes of driving behavior and to estimate the reduction of carbon dioxide emission by the implementation of eco-driving in daily passenger car use. Secondly, the methods were applied to the driving data which were collected through the society experimental trial in Hyogo prefecture, Japan. The results show that after the eco-driving training course, the eco-driving were implemented by five trial subjects out of nine. The maximum carbon dioxide reduction effect of 12.5 % was estimated using the engine mapping.