Do you run slicks Alex,or track tyres like 040,s or 888?
With the 350 I run slicks when weather permits and T1Rs or similar in the wet.
I no longer run intermediates like 888s on the 350 as even the hard compound does not give any form of longevity due to the weight of the car and at £1000.00 a set it is commercial suicide so it really is a no brainer.
With the R35 I have tried Dunlop and Bridgestone run flats. I am now on 285/305/ MPSS which are also Nitrogen filled but not run flats.
Alex