I use browse vehicles to get a feel for averages of cars, but it would be nice to filter or sort by country so I could show only NZ or only Aus or only UK results, etc, I'm tired of seeing those 1 dollar a litre avg. prices
We've talked about this in the past, but Fuelly isn't big and diverse enough yet to make a country filter worthwhile at the model level. One related item on our to-do list is to add country flags to the browse vehicle listings. If it's a model that's sold worldwide, that would show you at a quick glance if there are any non-US members with that vehicle.
But I don't think it warrants a top level filter yet. Over 70% of Fuelly members are from the US, and there just won't be that many collisions of other countries for any given model.