With regard to the question on tires for the GS/Z06 vs Z51. I had the 2014 Z51 for over two years and 37,000 km and found the tires to be great. Treadwear was surprisingly good. They started out at 8mm of tread and when I traded at 37,000 they still had 4 mm. I found the tires great in the rain and I drove in a lot of it on long road trips. However, once the temperature got below 10C the traction was not great, below 5C they were downright slippery. I have found the tires on the new Grand Sport to be virtually identical in performance. If you are going to drive in temperatures under 10C I would strongly suggest that you swap out for some high performance all seasons. I understand from folks who have the high performance option on the GS that those tires are truly amazing on the track but quite tricky in the rain. Since I don't plan on swapping out tires it is now time to put the new GS to bed for the winter. Changed the oil this week and will put the battery tender on tomorrow. Even though delivery did not happen till later in September still managed to get 7800 km on her.