I would just be happy to be able to click on a fill-up and see where on a map it took place. What if I got better mileage during one particular fill-up cycle and I really want to know where it was that I got the gas from. The map data is already there. I don't need you to display the business, because in my area I already know what gas stations are where. Just the location of the fillup would be great. I would even settle for the lat/long to be in the fill-up detail table. Can't you just drop the lat/long data on a map for the fill-up details?
Our concern with showing the fuel-up locations on the site is privacy. Everything at Fuelly is public. There's no ambiguity that way. What you put on the site can be seen by everyone.
Since location data is gathered passively—users have to agree to it, but they don't type the data in themselves—it falls in a different category. Putting that data out for everyone to see is something we'll have to think about very carefully.