I'd be in favor for the range of years, but not in favor of a separate field for model year and introduction year because most people look at the model year. If you were to mention that you have a 1985 Ford Taurus, Taurus fanatics will be quick to correct you because it was sold as a 1986 model. I'm pretty sure there's a fan club for virtually every car so that would be thousands of emails or comments about "Oh, the Hyundai Excel (or some other car) was introduced in ... , but for the ... model year so it should be (model year)."