with the constant development of f1 & now even more so,since the V8s.its seems a waist 2 spend so much 2 gain 0.01sec 2 loose it through tyres.tyres make up 4 so much of the cars handling & speed having a single tyre 4 all the cars is the fairest way 4 all.very glad to hear its goin this way,but why so long?