AO Silver Member
Join Date: Mar 2011
Location: United Kingdom
County: Greater Manchester
In the UK, there are only about 5 different brands available for the 19 inch tyre, which will limit your ability to 'shop around'. By contrast there appear to be many more options for 18 inch tyres.
I don't know about Australia, but in general in NZ they tend to use a much more coarse chip in the construction of the road, which significantly affects wear rates. I was driving around Melbourne and Gippsland on a work trip before Christmas, and I thought the roads were in better condition than in the UK