Just swapped to 18" Michelin cross climate 2. I'm surprised how much more comfortable the 20" Perelli tires are. Although I'm seeing a 10-15% increase in efficiency, so I'm not complaining. :
Michelin CrossClimate 2 All Season Tires for Sale
Absolute Domination: Michelin Cross Climate 2 vs Michelin Defender T+H - Top Tire Review