Pump them up to about 60 psi you will get much better fuel economy.
The tyres will last longer as well plus they will be virtually puncture resistant.
The ride will be a bit hard but in the snow you will not notice it.
Other than that pump them to the recomended pressure for the tyre size. They are simply tyres with a different tread pattern and a rubber mix more suited to cold weather thus why should the pressures be any different.
I usually run my winter set, indeed all my tyres at the lowest recommended pressure for the vehicle load and speed.
My reasons being an increased footprint which i believe must be better for wet and poor grip conditions and smoother ride.
I run Nokian WRG2's as winters on my ancient MB and i think there is a scale of pressures approved by Nokian which vary according to size, can't remember if its on the sidewalls or on their website.
I usually run my winter set, indeed all my tyres at the lowest recommended pressure for the vehicle load and speed.
My reasons being an increased footprint which i believe must be better for wet and poor grip conditions
Wrong, theoretically at least. By increasing pressure you actually open up the tread pattern which moves the water better and gives a slightly narrower profile which is better in poor conditions.
yes, MB's have tyre pressure sticker inside filler cap as you will know, recommended pressures relate to number of passengers/luggage OR by road speed.
I was told that Vredestein recommend 2.8bar for my Wintrac 4 Xtreme tyres. Their website confirms it. This is .6 bar over the car manufacturers . I tried this when I first had them and the ride was very stiff. I've settled for 2.4 which is comfier and the tyres work well in all conditions especially the wet and last year's one week of snow.