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Eco-driving is an environmentally friendly driving manner which improves fuel economy. Since Eco-driving has an immediate and significant effect on improving vehicle's fuel economy, introduction of devices, that main functions are measuring vehicle speed and elapsed time on-board, making alerts when drivers deteriorate fuel economy, and recording driving patterns, is being promoted to support Eco-driving. However, fuel economy improvement rates by Eco-driving show uneven distribution because many factors such as the weather, road and traffic conditions, types of vehicles and drivers' individualities have influence on fuel economy. In this research, correlations between fuel economy improvement and drivers' individualities were examined on a proving ground. Then, in order to estimate the effect of fuel economy by Eco-driving in real traffic conditions, test drives using more than 1,000 trucks were carried out for 5 months with compared to the data of no Eco-driving.

The Eco-Driving technique which includes measures such as preventing sudden acceleration and shifting-up at lower engine speed is attractive because it has an immediate effect on reduction of CO2 emissions from vehicles with minimal effort. In order to determine the main factors for reducing CO2 emissions by Eco-Driving, tests on urban roads were conducted with a light duty diesel freight vehicle operated by five test drivers under two driving scenarios: one with typical operations and one with Eco-Driving operations. As a result, under conditions of a mean vehicle speed of about 15km/h, the amount of CO2 emissions emitted during Eco-Driving operations by the test drivers were less than those of typical operations by 15% or more. It was determined that while under Eco-Driving operations, CO2 emissions in acceleration modes were greatly reduced. Other modes like cruising, deceleration, and idling produced less CO2 reductions.