I created a "Fans of Fuelly" group on Facebook for anybody who is interested. It would be interesting to know from Fuelly's admins if there were some way for a Facebook profile could be updated with your own latest Fuelly info (if you wanted it to) in the same way a Pandora account can be linked to Facebook.
Neat! If you want an image for the group, this one might work.
We don't have an official Fuelly Facebook App, but I explained one way to get your fuel-ups into Facebook in the last comment here. Importing your fuel-up feed is almost exactly what we'd do with a Facebook App anyway.