Have just finished a 3 week week trip with a total of 3500 km. The only issue we had was the alternator packed up and I had to have it rebuilt. This only took about 1 hour. The fault first showed itself by the engine missing without the alternator light coming on so I thought spark plugs, however a bit further on the alternator light came on too.
After the trip I calculated the average petrol consumption was about 15.5 litres/100km (18.24 miles/ imperial gallon) which is a little high compared to a modern car but what a pleasure to drive. Some of the journey was quite hilly and I often filled the petrol tank right up which added to the overall weight, however on the return part of the trip I got quite good at running the tank from half full only.
Once I figured out how to adjust the drivers seat height my wife enjoyed driving it too, which is a huge bonus! She described it as a low flying jet.