According to the owners manual a Fiat Bravo HGT has a 60 litre fuel tank.
Today I proved after 638.8 kilometres commuting you can put 59.53 litres in so that capacity must be about right. I know you shouldn’t run it that close, my usual fill is about 550km/50 litres, but—after putting it off on the way home—was glad I decided to fill up at the first opportunity on the way to work.
(Photo of not so nearly empty Bravo fuel gauge)