I wonder, would it be possible to be less vague???
I'm sure you meant high mpg, not low. Low would be like 9mpg....
Maybe you could offer a bit more insight into what you want, why and any special needs?
As a rule auto's will be worse on fuel than manuals. And proper 4x4's are rarely good on fuel.
If it's just a competition to find the highest mpg LR in your budget however, then a Freelander Td4 probably wins. But it might be completely the wrong type of vehicle.
A V6 Freelander (or maybe even a 3.2 FL2) on LPG won't win the miles per gallon number. But if either is fitted with LPG, then they probably stand a fair chance of offering the lowest pence per mile for an auto Land Rover.