[JABURKHOLDER]

There are a lot of products, tuners, chips, etc available to increase hp and torque. The majority of those products will do their advertised job. Products sold to enhance fuel economy very rarely work.

Internal combustion engines are not very efficient. As such, engineers tweak as much mpg vs hp/torque with current available technology and still put an “affordable” product to market. How we drive that product will greatly impact that mpg both positively and negatively.

As to the OP’s question...I wouldn’t do anything.
I have a 2016 F350 with the 6.7L. 440hp, 860 lb/ft torque and 4.30 gears. It doesn’t need any enhancements.