I tested 2 sets of tyres on my lexus is 250. And here are my findings.
Perelli zero Nero gt 235/40/18 on all wheels:
Good grip. Smooth ride. Comfortable. Good fuel economy. No road noise. Very confident in the wet.
When I added spacers I had to change my tyres because front was rubbing to
Perelli p zeros
Front 225/40/18 Rear 255/40/18
Less grip on back wheels. Lots of wheel spin and poor fuel economy. Engine works hard on these tyres. More road noise. Harder lumpy ride. Less confident on wetter roads. Need to be scrubbed in. I've only done 300 miles. They are getting better.
Think I'm gonna go back to the zero Nero GTs.
Much better tyre from the moment of installing