Hi Martina,

Well, all Discoverys are pretty heavy on diesel, because they’re big, heavy vehicles, but there’s no actual difference between four-wheel drive and all-wheel drive; they’re the same thing, just with some nuances depending on the car maker and model you’re talking about. You should expect to get around 30mpg from an old-shape V6 diesel Discovery, maybe 40mpg from the new four-cylinder version. A BMW X3, assuming it’s the one with the 2.0-litre diesel engine, should get 45mpg in daily driving.