Is it true that it is no longer recommended to rotate the wheels (i.e. front to back opposite corners, etc.) to even out the wear of the tyres? I use to do it relatively regularly in the "old days" but I now have an 18 month old 15,000 mile Citroen C6 which is a powerful front wheel drive car whose front tyres are down to 4mm whilst the back tyres are almost unworn. I was told by one of the High street tyre fitting chains that they don't recommend it anymore but couldn't give me a good reason.