taken from the Key Indicators for Asia and the Pacific 2008 published by the Asian Development Bank (ADB). Click for a larger image:
What is striking to me is that, at a glance, it seems authoritarian regimes fare rather worse. Once more, China's case is noteworthy. Here is a country supposedly poised to become the world's largest economy by mid-century being less than half as energy efficient as Bangladesh--hardly an economic powerhouse. Nor dose it compare favorably with its other neighbors in this respect. I have previously gone into some detail [1, 2] explaining why this may be the case. Authoritarian regimes tend to promote industries which allow them to retain the "commanding heights"--in other words, more of energy-intensive manufacturing. Further, authoritarian regimes are not particularly fond of eco-weenie (just kidding) activism: it's off to the gulag for you, buddy. The result speaks for themselves.
If I had more time, I'd try investigate a model using the above data regressed on various indicators of freedom--press, economic, etc. It's worth keeping in mind for a future academic project.