My 4.5T Dethleffs Esprit on a 3 litre manual Ducato chassis has just returned an average of 29.3 mpg over a 5,300 Scandinavian tour over six weeks. On the last day, just short of Calais Eurotunnel it dumped all of its coolant! With only 21k on the clock the Heater Matrix has failed. The replacement plus labour will be in the region of £1,000. The vehicle is not three years old and if it had been a Fiat Ducato Van, the work would have been within warranty. Why are conversions only given a 2 year warranty!