Prellis: i got ~12k from rears while fronts were still in a very good shape.They're really shit all around. I used to think they were good in the summer too, then I got my 2019 with the Michelins. No comparison, the Michelins are way, waaaaaaaay better.
Better ride, better sticksion, better everything. And the Michelins last 2X+ as long. I've got 14K miles, and they don't need replacing yet. I was replacing the Pirelli tires on my 2016 PP1 and 2012 TP cars every 6K-8K miles.
So I decided to replace just rears to minimize the cost.
Moving forward I'd like to get squared with lightweight aftermarket wheels.
With Pirellis it was very easy to feel a dis balance when fronts and rears have different degree of wear and you can't rotate them.
Staggered is for those who replace tires proactively once first signs of disbalance are there.