I've read good things about the Hughes engines FI airgap manifold, especially in the increased MPG category. My new (used) 98 ram 5.9 is going to be my daily driver if I can get the MPG to a reasonable point that my wife will agree with. I'm not looking to gain a crapload of power, but don't want to lose any either. I also found this in Jegs : Mopar Performance P5007852 - Mopar Performance Aluminum MPI Intake Manifolds. Anyone installed one of these, and if so, what kind of MPG (if any) / performance improvement did it achieve? My wife is threatening to make me get a little beater car to drive if I cant find a way to up my MPG. I've done a tuneup and all of the standard things to increase MPG, just looking for some more.