Ok, if fuel efficiency is your main priority then maybe an SUV isn't for you? Have you considered instead either an estate car (I'm assuming that you're buying an SUV because you need the space)? The new Volkswagen Passat Estate or Ford Mondeo wagon are excellent options. 

 

Or, if you actually need the four-wheel drive traction, how about a half-way-house like the Skoda Octavia Scout or SEAT Leon X-Perience? Exceptionally capable cars both and 50mpg easily.