With Variable Tuning you get your power mileage and towing tunes all in 1 with no hassle of switching or having the wrong tune on.
It measures trailer weight by using calculated torque and the hundreds of on board sensors recording data in real time. Just Press Tow/Haul and it adjusts to the exact weight of the trailer. This happens in roughly ¼ mile of driving
For mileage it uses highway timers, avg throttle and many others to decide Fuel, Boost and shifting, this allows for you to drive the truck nicely and get unheard of mileage numbers.
For power it simply measures how Aggressive you are with the throttle, it can calculate how fast your foot moves on the throttle. The tune will always default to its highest safe setting
This way theres no chance of a switch failing on the wrong setting. Simply drive and let the extremely smart computer switch faster then you ever could