[BackroadBomber]

I've recently been thinking about running some seafoam through my rangers engine to clean out some carbon in the intake manifold and inside the engine. Would this improve fe or hurt it? I thought that with more carbon on the pistons, the compression ratio is higher and that's better for fe? I'm pretty much grasping at straws here I loaned the truck to my buddy for about a year, and when I got it back I fixes the egr tube (it was broken), the dpfe sensor, and put manual steering box in (pump was shot), and got an alignment. Everything that he broke is now fixed and its still not getting the mpg it did a year ago.