1. They've been pretty reliable for the most part.
2. Nothing major. I have one common issue where the trunk hatch doesn't open properly, but it's a TSB fix from the dealership so no worries there. The only major issue I think is the oil temperature one, but that only becomes a problem when you're tracking it. In that case, you would need to get an oil cooler.
4. The 7 Speed Auto is of really good quality. The Auto Z's have been proven to be a couple tenths of a second quicker on average than the manuals. I know this from experience
5. MPG expectations depend on where and how you drive. I drive around 70% highway and usually pretty calmly. I am currently averaging 23 mpg per tank.
Good luck and hope to see you in a Z soon!
