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I just leave mine in level 2 all the time, makes it a lot nicer to drive empty too, only other thing i did was adjust my speed limiter up alot...just incase
+1 - Go with the Edge Level 2 - Towing tune. Those folk are Edge are very smart and have optimized that tune. It's awesome and I've never seen a reason to tweak it.
I have ran it in the trans only mode and tow mode both with no trailer seems like better mileage in trans mode so I might run that one when empty and run 2 when hauling and pulling