I guess what they do there is the Fischer-Tropsch process (
http://en.wikipedia.org/wiki/Fischer%E2%80%93Tropsch_process), which typically produces toxic dioxines when using household plastic.
It's efficiency is also rather bad - typically below 25%.
A german inventor has found a better process with (claimed) efficiency above 60%, producing Diesel at 0,25€ per litre (roughly 1,22$ per gallon).
They have a working protoype plant using woodchips for a few years now, and a commercial plant that processes the plastic garbage of a county in Germany since April 2012.
They claim to be able to process any carbon based material - so any kind of bio mass can be used.
Could be the technology to end the waste of food plants for producing fuels.
Imagine a fast growing plant like hemp or bamboo usable for renewable energy, instead of using corn or wheat to produce ethanol/bio diesel.
If interested, take a look at their website
http://www.alphakat.de
