Nah I got bollocked for being in late so have refrained from STW..
Re longevity, most winter tyres are silica compound which makes them last really well. You will get many many winters from a set. And whilst they are slightly more squirmy, particularly when warm, they grip like hell.
Re fuel economy, Nokian WR G2 were amazing, probably 10% more than the Dunlop Sport they replaced. Maybe even slightly better than the Nokian summers I have.
Nokian always get great writeups, especially for winters, but they are really hard to find here and the no-one stocks them.