Spose it depends who's driving them - so many 'soccer mums' putting around town doing short trips in unnecessarily large 4x4s, or D'heads that just cant drive. We get heaps of blocked up diesels at work, particularly Navara's, iLoad/iMax and Mercedes.
Also funny you mention the POS CVT Xtrails, we have two of those and a Renault Koleos (built on the same platform as Xtrail) - all waiting for new transmissions...