Early G1 (Golden Age): 1984-85
Early G1: 1984-87
Early and Middle G1: 1984-1990
All of G1: 1984-93
Other (please specify)
And of course the fact that this mould is giving us 3 (or more) realistic vehicle alt modes means that in a couple of years Hasbro will be selling us Penny Racer versions of these characters just to get more money out of people like me that want cartoon accuracy.
I have a list of all G1 characters that have been released in CHUG form. You can find it here. Please feel free to let me know if I got anything wrong so I can fix it.