I am not sifu but just to share, recently changed my 1.8A stock livina 185/65R15 (Dunlop) to 195/60R15 (Michelin XM2)

Pro
more stable & confident when cornering

Con
immediately feel slight lossing power during pickup but not much different after running at 4th gear.
Note :
185/65R15 tyre pressure at 235kpa
195/60R15 tyre pressure at 210kpa as per tyre shop recommendation, tried 215kpa start feel bit bumpy.

This post has been edited by mck_cf: Dec 5 2011, 06:41 PM

Sorry, never use yoko before, can't give any view

185/65 to 195/60 is the most closer choice that contribute
- less differences on odometer reading (1% faster).
- car height lowered bit
It do affect fuel consumption bit, for me acceptable.

185/65 to 195/55
- odometer reading (about 4% faster)
- car height lowered more

This post has been edited by mck_cf: Dec 6 2011, 09:40 PM