I have a T660 with a studio sleeper. I am thinking about getting a turbo wing to increase fuel mileage but I am skeptical about how much they really help. Has anyone who put one on their truck seen good fuel mileage increases?
Probably depends on your set up. If your pulling a van and your truck is a mid roof without a dam, it should help some. Doubt it will help as much as a air dam.
If your pulling a flat or step, it will really cut your mileage as it did with mine so I took it off.