I don't have any first hand experience but the territory should be thirstier than a falcon, especially the 4x4 version and town driving.
If I were doing a lot of kms and towing I'd definitely get the diesel, but the petrol is probably a little more reliable and is cam chain driven so doesn't need a cambelt doing.
Both the 2.7 diesel and 4.0 petrol have gone into a lot of other cars so there is plenty of info out about them both.
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