Rich, I thought the thicker the oil at high temp the longer the life of the engine. Thinner oil may give lower consumption at the price of increased wear? The temperatures in Germany are similar to the UK, maybe they account for the fact you don't have speed limits and the engine may run at high...
If you rotate frequently - e.g. whenever you change summer/winter tires - the difference in tread wear front/back will not be significant and you won't notice under/oversteer, just a progressive lack of grip, down to the level when you will feel it's safer to change all tires. They all say it's...
I had the squeak on the half leather seat. Not a big problem though, gets fixed easily.
More annoyed of the wind noise, I would have expected it to be more silent given it's sold in the US as a luxury car.
Finally got to it, Honda dealers in Germany replaced the sponge without any cost. At first the leather on the seat appeared squished, it came back to its original form after sitting a while in the chair. Well done Mr. Wagner!