Factory A/C in 1967-1972 Darts

Jim Kueneman said
I am I retired engineer who has seen many times how data taken incorrectly or poorly can cause incorrect conclusions to be drawn. My job was to question data and analysis. Even in the field of trained engineers and scientists there is a lot of problems with poorly executed experiments. I don't trust any data unless I understand where it came from and how it was collected. That is all I am saying.

I agree. It is common practice in industry to tailor specifications for parts to the most favorable conditions. So they are not really lying, if you could maintain the ideal conditions, the part would perform as specified. However, your environment will likely not be ideal, so your performance will be less. I am an ‘almost‘ retired engineer as well.