Well, the Crossclimates are now at 3.5mm on the front at just under 115500 miles, so, 24,500 miles so far and i've used 3.5mm and have around 1.5mm left before they need replacement.
However I now have a dilemma, both front tyres are leaking from the rims and one is losing about 10 psi in around 5 days, the other only needs a top up every 2 weeks and only a few psi. This started shortly after I stopped having to use the car every day, I used to pump the tyres up on the 1st of every month and would never put more than 1psi (if anything). So, my dilemma is do I just get 2 new tyres now or do I get the tyres refitted as with the amount I drive now they'll last over another year until replacement is needed and that might even be new car time.