Theres few videos of people making car fuel from plastic by 'destructive distilation' (OK, we put it in a steel tank, roast the hell out of it, condense the vapours) on Utube.

I did a quick run of it, need a better condensor & free time to do it in, & got 50mls of a nice pale gold coloured liquid thats really really flammable & a little smokey.

& probably cancer inducing