Abstract
If everyone drive a car considering energy saving, cost reduction and improvement of domestic energy consumption can be achieved.It is also effective for environmental measures and climate change problems. In this study, a lot of data has been collected by the digital recorders which are attached at monitored cars. The data obtained from over one hundred monitored cars for one year has been analyzed. Then, it is found that the fuel efficiency is dependent on some of driving techniques. Namely, smart driving can save fuel consumption. Finally, a control system for automobile driving has been developed. This system is useful to satisfy the feedback loop for saving fuel consumption.