Fuel Economy 99 TD Ulysse

I run a 99 plate TD Ulysse which has not been a bad beast over the last two years. Work is offering me a car allowance but here's the thing - I have to run something under 165 g Co2 per Km to get the full amount so it's goodbye to the Ulysse. I am looking at VW Touran to replace it and whilst working out costs I worked out that I am only getting about 25 mpg in the Ulysse - is this right?! I reckon I get about 550 miles out of it and it's got a 85 litre tank....either I am doing my maths wrong or the car is well thirsty....does anyone else have a similar experience?

Depending on your drive it could be about right. We have the 2.2 diesel and can manage 34 MPG on a good run but round town it can be 30MPG or less.