Maybe she drives a lot more miles? I know SUVs are mobile bricks and have worse economy but they can't be 4x worse. My wife likes the high, 'safe', driving position an SUV provides. I prefer the lower centre of gravity an estate provides. Personally I don't need to sit high to feel safe, I just need to be observant of all the other morons around me on the road. I prefer the boot space in an estate too, which is generally longer if not quite as high as an SUV.