Shotgun's correct. There's no reason to set your truck back to stock unless you want to drive a truck that's "badly tuned".
Seriously though, read through this Q & A:
http://forum.gopowerhungry.com/faqs-...ions-menu.html
Near the bottom you will find the reasons for setting the truck back to the stock tune.
You might also look at this post:
http://forum.gopowerhungry.com/faqs-...ions-test.html which tells you why you should not set the tune to stock prior to an emissions test.
- Jack
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2024 F150 Platinum SCrew 3.5L PowerBoost FX4, Peragon Tonneau Cover, LineX Bed, 35% Window Tint on All Sides and Rear, Full Nose Paint Protection Film, Husky Mud Guards, Lasfit Floor Liners, VIOFO Dash Cam