I decided to fit winter tyres this year, and now use Avons on 16-inch steel rims to replace the original 17-inch runflats on my BMW 3-Series. As expected, grip is great, but there is also a very noticeable improvement in ride quality and a reduction in tyre noise. Most surprising is a reduction in fuel consumption of about 5 per cent, even in these colder conditions. I know you favour runflats on safety grounds, but it seems there is a price to pay apart from just their additional cost.