According to Dizzy's site, 4th gear pull. That's a longer road and a nice speeding ticket...I have to get way out of town for that.
Datalogging How-to (Ford)
Only WOT datalogs need to be performed on Ford vehicles. Due to the Speed Density based ECU logic, the ECU has the ability to automatically adjust for a variety of intakes and intercoolers on the market.
WOT logs should be performed in 4th gear, after the vehicle is fully warmed up.
Drive the car in 4th gear at around 2,500 RPM, and press the center button to begin recording. Press the accelerator pedal all the way to the floor and rev the engine up to 6,500 RPM. You can then let off and end the log by pressing the center button. It is very important that you start your WOT pull at 2,500 RPM and end your pull at 6,500 RPM.
As always, be safe and courteous to those around you. Try to avoid any traffic, if possible. I also want to mention, the flatter and straighter the road these logs are performed on, can greatly improve the results of your custom tune. Consistency is very important during the e-tune process.
https://dizzytuning.com/pages/tuning-info