I'll never understand why so many folks buy a truck, then spend so much time and money to make it into what they need. If fuel mileage is the goal, buy a VNL or a Cascadia, not a brick built to haul 100k+ loads.
Back when I had my WS, guys that had the turbo wing claimed .05 mpg increase. I like the way they look. Big ones on a flat top, small ones on a mid roof. Never did get one, though. $1000 in 1997. Fuel was 1.00 gal. I still like the look. Must cost $2000 now.
I just saw the link. Go for it. It will make enough difference to pay for itself..... eventually, Lol. Looks nice to me. I’d have to get the small hood wing too. Fender wings? That’s a bit much. Hood wing looks good though. Practical as a heavy duty bug shield, and deflector for rocks hitting the windshield. That’s my reasoning, has to be practical. Lol.