I just got the truck up and running with an AD 150, Vulcan Draw straw and an Industrial Injection "bag of parts" cp3 kit. Now that I have the extra filtration I'll bump up the rail psi and see how she goes. It does feel like it comes on sooner/stronger with these. Hopefully the rail psi will help with the mpg. I've also gone from 325/60/R20 to the stock size 265/45/R17. It's not even funny how easy I can break loose these little tires.