Citroen Xsara Picasso SX 2.0 HDi Review

this is my third picasso first being the 1.6sx which i found to be alittle under powered as i tow a caravan but no main problems,next was the1.8sx same again but abit more power then i was offered a 2.0 hd 04 exclusive model with 219000 miles at the right price new timing belt and service a few bits here and there shes done a further 3000 miles the family call her the mile muncher mpg is as good as in any hand book someone as said the milage is the same as going around the world nine times please let me know if this is true as on the way to ten times.