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Golfgod may be on the right track...the automotive model year may traditionally be related to when the assembly lines get re-tooled for the new production run.
It may also have something to do with the shifted fiscal year that corporations use, from October 1st to September 30th.
But I found a plausible answer on Wikipedia: cars are mostly advertised on television and as the new television season starts in mid September the automobile companies bring out their new models to coincide with the new TV shows.
Some types of vehicles (in some states) have a service life mandated by law....like school buses and taxicabs. Our fleet of school buses must be disposed of after 15 years of service.
So the manufacturers will bump up the model year so fleet owners can keep 'em longer. We've been driving our new 2011 buses for a few months now...
My 1991 Chevrolet Caprice Classic was made in April of 1990.
My 1990 Buick Century was made
in June of 1990. The Buick is 2 months newer, but its a older model year.
This was because the body style for the Caprice was new for 1991, but it was available in early 1990 so they made it a 1991 model. I have seen other cars like this over the years. Seems kinda odd though.
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