Has anyone found anything to help improve their gas mileage? I'm thinking of getting the following; Throttle Body spacer (Crane), K&N filter (should I go with the regular filter or with the cold air intake filter), 8mm wires, and Bosch platnum 4 plugs. Do you think these will help much? Anything else? This stuff is going on a '96 4x4 ext. cab 5.2 engine :help: