Power runs are runs done at WOT (wide open throttle). It is a guage for max hp a car produces under WOT conditions.

There are those who look at the graphs and comment at Torque under WOT. I do not drive my car under 4500 rpm on the drags and wait for my turbo to spool up.

On the track and/or on the road, I will not be under WOT condition all the time(not even half the time).

Power runs are a guage of your vehicle under WOT conditions and it does not show you how the car is performing under other load vs rpm conditions. It is only a good indicator of max power and torque.

Dyno figures will differ from dyno to dyno, but a WOT power run is a good indicator of where ther power and torque of your vehicle is before and after a tune..