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We currently have a 2000 Ford Expedition.  We love the room available, but of course the fuel economy leaves much to be desired.  We have been considering looking for a vehicle that gets better fuel economy, but would still be "big enough".  We currently have a two and five year old, but are expecting another child in January.  So, "big enough" means that it can fit 3 car seats, and two adults.  Cargo space should allow for a few bags, a cooler, and a tent or so (enough room for a family of five to go on a weekend camping trip).

A co-worker has a Jetta TDI wagon.  That seemed like the perfect solution, except for the fact that I don't think we could get the three car seats in  the back seat.

I have considered the Ford Edge Crossover, a Dodge Grand Caravan, or the Saturn View.  While these would be big enough, and have better fuel economy, they still aren't great on the mileage.

Does anyone have suggestions of other vehicles?  

The 2007 X3 is pretty fuel efficient from what I gather.