lol i'm not from az i know about air quality. i know the diff in et's from a neg da da to a post da day. I know the diff between a correction from a winter dyno pull to a middle of the summer dyno pull and its not that diff. I can post time diff between neg 500 da's and positive 1000+ da's and well its only a couple mph not 5 or 6 its 1 or 2. Now let me teach an old dog a new trick..you do realize that it takes more then 1 rwhp to raise your speed by 1 rwhp. only thing i'll agree with you on is a dyno is more for tuning purpose but it does allow for a range and est of what a car should run. I say a range because old man there are other factors a senile old man might not knowif its called traction and weight. The key factor is your power to weight ratio. Also did you know that a dyno correction factor compensates for weather and give you "The actual HP figures"yes they are still a little off but again not 50+ rwhp like your et states. What are you going to tell me next elevation and da's dont have an effect on your et