Hi all, I have a 2008 E90 sport package 328i. I am thinking of replacing the original tires with non-run flats and with all season tires -- I do not do enough snow driving to get winter tires. There now seems to be a real selection of ultra high performance all seasons like the Continental DWS, the Bridgestone Potenza RE960AS, and others. Anybody have any experience with these? Also, the dealer said that an E46 donut might work as a spare, but was not sure. Anybody try this? Thank you all much.