Right now there is a lot of product and shops out there that makes modification for fuel efficiency
Modifying your truck to increase its power and fuel efficiency might be a good investment because you want to help reduce fuel dependency while gaining more power in using your car, this could save you more money.
There are many modification right now claiming they are the best that save you gas out there.
First step is to do your homework, make a research and study there test results and have it a free trial
in your own truck or interview people you know that implemented it on their own car. In this way you can make the right decision.