My turn, I have two figures for you. My 1995 SWB120 MK5 2.5DI 70PS, 218,000 miles. Running mostly empty on short journeys to work and back (less than 10 miles each way) occasional motorway run 100 miles round trip.
362 miles, filled up 62 litres, giving
26.54mpg.
Post filters and oil change. Filled up today after 452 miles 58 litres (@110p/litre!
) giving
35.43mpg. Fuel guage was reading empty, but I was expecting to fill much more than that, so in theory could have gone approx another 60-70 miles before running out, based on a 68 litre tank capacity. Giving a tank range over 500 miles.
Shows you what a difference a dirty clogged air filter can make. I reckon 40mpg is within reach.