許多汽車製造商一直在從事環保車輛的發展，以滿足由政府制定的環保法規和公眾所要求履行的社會責任。然而，一方面，改善的環境績效，另一方面傳統的性能顯著提高。本研究主旨在於使用結合傳統和環保性能的兩階段DEA，藉以評估綠色汽車的能源效率。本文包含四個類型的假設制定，包括車輛類型、車輛製造商的起源、車輛尺寸和公司的組成類型，並文使用截斷式回歸分析，以檢定綠色汽車的能源效率和獨立變量之間的關係。從最近一年的數據指出，小型車和規模較小的汽車製造商表現出較高的能源效率。儘管如此，車輛類型和汽車製造商的起源與綠色車輛的能源效率並沒有顯著的相關。

Many automotive manufacturers have been engaged in the development of green vehicles in order to meet the environmental regulation set by government and fulfill the social responsibility required by public. While improving the environmental performance at one hand, however, it is significant to improve the traditional performance at the other hand. This research aims at evaluating the eco-efficiency of green vehicles by using two-stage DEA combining the traditional and environmental performance. Four hypotheses including vehicle type, the origin of vehicle maker, vehicle size and company type were formulated. Truncated regression is used to analyze the relationship between eco-efficiency of green vehicle and independent variables. The result from the data of the latest year indicates that smaller vehicle and smaller automotive manufacturers show higher eco-efficiency scores. Nevertheless, vehicle type and the origin of vehicle maker are not significantly correlated with the eco-efficiency of green vehicles.

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