This study includes the mandarin farms which perform and do not perform good agricultural practices in İzmir province. The basic purpose of this study is the determination of energy use efficiency and economical comparison of the farms performing and not performing good agricultural practices. The 20 mandarin producers who applied good agricultural practices were interviewed and data were gathered by using questionnaire method in İzmir province. In the same provinces, the same survey was also conducted with the same number of producers which did not perform good agricultural practices. According to the results, energy output/input ratio, energy productivity, specific energy and net energy were determined to be respectively as 2.24, 0.93 kg MJ-1, 1.07 MJ kg-1 and 58925.62 MJ ha-1 in the enterprises performing good agricultural practices. Energy output/input ratio, energy productivity, specific energy and net energy were determined to be respectively as 2.04, 0.85 kg MJ^-1, 1.17 MJ kg^-1 and 56301.02 MJ ha^-1 in the enterprises not performing good agricultural practices. In İzmir province the cost of producing; one kg of mandarin was calculated as 0.52 TL in the enterprises which applied good agriculture while it was calculated as 0.47 TL at the enterprises which did not perform the good agriculture. Relative profit was determined to be respectively as 1.24 in the enterprises performing good agricultural practices and 1.19 in the enterprises not performing good agricultural practices. According to energy output/input analysis and economic analysis results, mandarin farming was determined to be more advantageous in the enterprises performing good agricultural practices.