Contour Enthusiasts Group Archives Forums Modifications Forced Induction Proper data logging

You need to do both. At idle, at light cruise in 3rd gear, and then a 3rd gear pull from a lower rpm.
During your light cruise datalog runs, pick rpms that are easy, such as 2000, 2500, 3000, 4000 rpm so that you have several runs that represent different airflows and thottlepositions.
Then the full throttle run from say 1500 all the way to redline in 3rd gear will show how the fuel system is metering in WOT mode.
The cruise runs will show how your O2 sensors are working along with your MAF and of course the fuel trims will help determine how closely the tune is matched.