What to do...

PRH said
The NHRA altitude adjustment factor for that track, to correct back to sea level is:
ET - .9612
MPH - 1.0369

So, an [email protected] would correct to [email protected](at sea level)

Wow....
I wonder how real world that is. I have seen with various cars and combos 2000 feet make 2 tenths difference on well sorted cars.
So 4,000 feet make 4 tenths difference of that follows..
7000 feet difference...???