[Lexman8]

Done ~5,000 miles and average is 33.6 mpg. Many short journeys, occasional mid-length of ~30 miles and the odd long motorway trek.

I do think the XC90 would benefit in several ways from a larger engine. My old Merc which weighed the same as an XC90 had a 5 litre V8 petrol engine and could manage 32 mpg on a long run (okay, it was ~18 around town) but comparing that engine with the one in the XC90 (5 litre vs 2 litre, petrol vs diesel) you'd expect the '90 to be far better than it is. A small engine in a big car probably isn't a good idea.