IATA issue fuel prices each day, just trying to work out a way to glean that information off their website and build it in to the project I'm working on. Probably won't be seen for a while though, I'm afraid, but will endeavour to release the code when/if I get it working!
For now I have a cron job that makes changes to the DB every 24 hours, changing to a random value between two figures, to try and give some realism