I got a Fiat Doblo in November 1.3 multijet diesel - 44mpg average round town and 740kg payload (I've got a 400L tank plus backpack in it now) but even with me, a full fuel tank, hose reel and accessories you could go to 500L.
Because it's MVW is exactly 2000kg I can drive at car speeds where the national speed limits apply on both dual carriageways and other roads.