I had one and it wasn't especially economical but then I didn't expect it to be at that size. Towed really well but it became known as "The Shed" 'cos it was a b***er to park and manoever in our small town so I sold it (had nothing to do with the fact it was a 7 seater and I didn't have 6 friends as was suggested!!!)
) which does around 25 miles to the gallon on short run-around journies, but slightly more on longer, cruising journies.
It does tow REALLY well though, so it's forgiven for its fuel consumption.
We have got one (well mum has as I am too young so dont really have a clue!) but she loves it! And after having so many different vehicles to tow with she likes this one the best and it hasnt broken yet (we seem to be cursed)!