Unfortunatelly this rate certainely doesn't apply to 914 ...
Quote from recent press information:
"Well over 70 per cent of all Porsche sports cars ever built still exist today and are still driven actively in most cases – in both summer and winter. Indeed, even classic Porsche models more than 20 years old still offer the kind of performance today one would expect of a modern sports car. But the tyres fitted when such old and new classics were still in production have no longer been available for years. Tyre treads and rubber compounds have changed in an ongoing process of development, thus influencing the driving behaviour of such old Porsche models."