Exactly the same answers as your question about the Clio but with the addition that it's diesel so it will have injectors and glow plugs to worry about. You really can't get an answer about reliability, it depends on how well it's been looked after. If the car has been serviced properly the diesel engines are good for very high mileages.
Consumption figures here but expect it to be typically 10 to 20% worse. No one ever gets those numbers.
first one for a motorway run to Wales to visit my daughter (approx. 110 miles round trip 3 passengers)
and the other is to and from work (average over a full tank mostly B roads 24 miles each way with just driver)
I have had both better and worse figures depending on number of passengers and if I have the roof box on or off.
Other's on here have had stated different average MPG's but their cars are either manuals, hatchbacks or coupes whereas mine is an auto estate.
Both of these photo's were take within the last three months car has done just over 136K