So, I just bought a 1998 Dodge Ram 1500 5 speed 2 wheel drive. Sadly its not a diesel but whatever its my traveling truck. But I was wondering if they're any mods, updates, add on's, or whatever I can to increase gas mileage and maybe even power. But mainly gas mileage.

Oh right, forgot to ask. How much could I possibly increase the fuel mileage to both highway and city?