I've ordered Crossclimate+ as well. Coincidentally, I have 27K miles on my 2018 (delivered 12/17) Clarity and the OEM tires have become downright dangerous in light snow (the treads still look pretty good so age probably contributes). I almost crashed going slowly around a corner. It's gotten pretty bad on wet pavement too. Until I get the new tires installed, I only drive the Clarity on dry roads. When the car was new, I was impressed with snow handling so beware if your tires are getting to 3 years old. The Crossclimate2 is not currently available in Clarity's size but don't worry that you're getting an obsolete tire with the Crossclimate+. The below video explains the difference (probably accurate because Michelin supplied his tires). The Crossclimate+ was designed for the needs of European drivers while the CC2 was designed for the US market. The CC+ has better handling and braking in dry and wet conditions (according the Tirerack tests) while the CC2 should be better in the snow and last longer (according to Michelin). For folks here, the CC+ should also provide better fuel efficiency/range than the CC2 (again a greater priority for European drivers). The major plus for us is that the CC+ will provide superior performance to OEM on all aspects except range.
BTW, the CC+ also has a higher load rating (important for a heavy car like the Clarity), temperature rating (A vs OEM's B), and speed rating (Y vs OEM's V) compared to the Energy Savers.
The Crossclimate 2 being limited in sizes was something I found quite disappointing because you can buy Michelins everywhere. Fortunately, there are competitors. Nokian recently released their WR G4, and as the leader in the true all season tire segment, it may even be a slightly better tire than the CC2. I would not be surprised if many of the things you/Michelin said about the CC+ vs the CC2 are also somewhat accurate with the WR G4 standing in for the CC2 - I do know they specifically mentioned wanting to get the tread life up for the WR G4 for US customers, but I have not seen any performance change mentions - albeit such things are rare to run across in the tire world at times. The Nokian does come in 235 45R18 as well as other less common sizes. I have these tires on my Toyota Corolla, and they are great. Frankly, except for specialized tires, I have no idea why these all season tires not the majority of what is sold in most 4 season climates. They feature many of the improvements of dedicated winter tires. Our Toyota Corolla has been noticeably better with these tires than our 4wd suv with new Bridgestones in several conditions - snow, sleet/slush, and rain.
Tread life is in the 60k range but the all season benefits are well worth it IMO. The price is not bad, the downside is that not many places carry them. You can buy them on Amazon, but for local places you can order them on Walmart.com for installation at a local store and is what I went with. I think Discount Tire can order them also (they only have the SUV version on their website, but you can order from the store), but that was the only alternative around us. Walmart was a bit cheaper all around and there are thousands of locations for any issues. Because they are not in stock anywhere and have to be ordered, the tire guy suggested we keep one of our old tires in case of a replacement issue - which we did.
These tires are a bit stickier than normal tires, so I would expect to lose some mpg, especially vs energy savers. I would say 1-2mpg on our Corolla vs some hard 90k tread warranty Continentals. I felt like the trade off was worth it given the improvements I noticed. When I get my Clarity, I will buy these tires whenever I wear out the OEM.
https://www.walmart.com/ip/Nokian-WR-G4-235-45R18/262994329
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