So recently, I got a grant for using the NSW state government's Fuel Pricing data in a relatively small, personal project (you'll be able to access some of the results on this very blog in fact!) - it's just by lucky coincidence that Fuel pricing seems to be the talk of the town at present. The goal of the project is simple; "Historical fuel price tracking across NSW, Australia. And to provide a service to find the lowest price fuel nearest to a user."
It's little more than just some hobby tracking project - using a dynamically updating data set, there's just an added benefit that it'd let me save some money hopefully :)