Quote Originally Posted by Graeme View Post
The other afternoon, in a fascinating programme on TV it was mentioned that the same applies to petrol - it takes more energy at the refinery to produce a litre of petrol or dieselene than the litre contains.
Interesting. Does it take more energy to produce than it contains, or more to produce than can be extracted from it? I remember that only about 40% of the energy in the fuel is actually converted to energy in a combustion engine.