I think it is a really good idea....
We are starting to see a lot of queries about LPG, and there is a lot of knowledge her on how to do it and some of the issues, we have in the past had repeats of the same common questions, i see it as a reference that people who have LPG or are looking to convert can see easily.
I know you can do a search, how many times do we see people posting queries and it is clear that have not used search
The reason why there hasn't been a demand for petrol or Diesel sections is because the cars came with it a standard and so they get dealt with in the help sections, LPG is different in that respect.
I don't know how hard this would be to do, why not make is a subsection to general help, see how it goes, give it say 2 months, if it dies a death then merge it into general help and let it slip down the forum?