Agree with Nospam. I hung on to the runflats on my 650 for years thinking they were the latest technology in tires. I was really, really surprised at the improvement in ride, road noise, and mileage I got once I was convinced to switch back to conventional tires. I don't have a spare, but I keep a tire inflator/repair kit in the trunk.
MY2007 650 conv | Stratus Gray | Black Pearl | HUD | Night Vision | Sat | Logic 7 | RT Traffic | Cold Weather | 6-speed Euro Delivery completed 9/15/06
MY2008 X3 3.0si |Monaco Blue| Sand | Sport | Prem | NAV | Auto | Euro Delivery 9/21/07
2004 X5 4.4i (retired)