[Dave-ROR]

Originally Posted by Tajefe Couple

I think the mpg requirement was slowly increased until a certain year. Perhaps that's why my other cars fell under the criteria. IDK but when validating your point think I saw something to that affect. Not certain about years and requirements but perhaps had something to do with it. Did also come across that about EPA mpg being determined independently of the manufacturer claims like you said. Help me out if I got any of this wrong as I've had my fill of looking up the GG tax Lol.

Yeah I think it was 1991 for the last adjustment to the MPG so your cars would have qualified. I was looking at new Trans Ams in the ~mid 90s and was surprised that they didn't get hit with it. I don't recall what they were calculated at but it must have been higher than 22.5 with the modified EPA calculation. That's all 6 speeds though, I have no idea about the automatic cars and what they got for fuel eco. GM may have gone to a really tall rear gear to get it to pass or something - at that price point a GG tax would have been an issue for buyers IMO.