[QUOTE=Vekke;277979]This is not true. Winter tires has best rolling resistance figures of the current tire models out there. Nokian Hakkapeliitta R is the best out there. In same pole position is Michelin XI2 and few others. No summer tires can match those figures at the moment.
Well as I so often have to point out around the ecomodding topic, there is theory (numbers and figures) and there are real life facts
For anyone who has grown up around real winters and the need for winter tires it's common knowledge that the rubber mix in the winter tires are of softer mix, so that they will have more traction (aka friction). This is why if you run the un-studded winter tires in summer they won't last as long as summer tires ("been there done that" many times myself).
Now the flip side of this is that the studs themselves make for LESS traction on blacktop (non ice/snow conditions) this fact is even covered in "traffic school".
Something I just ran across recently (having a soft spot for the idea of a TDI Porsche TDI idea
), and having already purchased LRR tires for my Mk3 Golf TDI is this: (starting at around 0:50min)