I got a 3.5 Shogun auto. Does 25mpg which is good really guzzles when you boot it though as you would expect. Has 260bhp, plenty of pull to annoy the boy racers!
The fuel consumption is better due to the power to rate ratio. Bigger engine size, more torque, less power needed. With this one, if for example you are cruising at 60 with a caravan on the back and you climb a hill, you dont need to move your foot, it uses the torque to climb up! It just stays at that speed! To give you an easy example lets go book averages here. Shogun 3.5 does 25mpg. A freelander 1.8 does 14mpg. This is purely due to imbalance of the ratio. The freebies engine is revving harder and working more to maintain speed thus uses more fuel.
Things to watch are rust underneath if its been abused, seized brake calipers which can get pricey, Thats about it really! Do also check axle (rear) on all shoguns and pajeros as they do have a history of snapping on the weld. Rare but it happens - check regularly!
Other than that great cars...i would sell mine for a landcruiser or a patrol, other than that i will stick with her! I do know of a mate who does have a 3.5 for sale. Not sure if its the same as mine cos mine is a special edition which queer cream leather! lol! But might be leather!