1 thing I've noticed is, that by having a larger drum, I don't do as much washing each week

…… 'cos it takes more clothes. It makes drying inside more difficult as I run out of space

………. so it must be 'greener' to have a larger drum, initially for putting the sheep skin rugs through when it's a sunny, windy day so they can get a blow after washing.
I've cracked the programme required: cottons, 60 degs., 'quick' means 5 mins. under 2 hours. It switches off automatically if I don't go to it when it bleeps to say 'finished'.