Yes! We are working hard to keep our database up-to-date in terms of petrol station. If something is missing - you can add new petrol station by yourself. You can do that while adding new fillup.
No need to be at the station since 7.0.10 version. In Fuelio 7+ you can add new station using this method (see image).
Another way is to send us mail with location of the station and name.
See the screenshot - Adding new price (Home -> Add Fillup -> Click on Select station)