Thanks, understood, though I have always found that rather confusing. Tesla does not seem to use the traditional "model year" concept for the S and X, but it seems that they did for the Roadster, as I can recall more than once when talking to Tesla about my Roadster that they referred to it as a "2008". Just checked the sticker on the driver side door and it shows "Month & Year of Manufacture April 2009" (I did not remember the month correctly in my post just upthread).
So on my 1.5 which is VIN #425 it shows as manufactured in 2009. My understanding is that the last 1.5 was built in May of that year and the 2.0 version went into production in June 2009 or thereabouts. So again it is confusing to me why Tesla skipped the 2009 year designation. Car companies that follow the traditional model year concept (all other car companies, as far as I know) generally introduce their new model year cars in the fall, as in around September.
Personally I dislike the traditional model year concept and applaud Tesla for no longer using it.