Get the synthetic fluids and skip the Slick 50. The PTFE(DuPont won't let them use the Teflon tradename) could deposit in places where you don't want it, and the base oil is likely thicker than what your car recommends. It could hurt efficiency.
For efficiency, warm intake air is generally better. It's less dense, so more is needed for a given power point. Which means wider open throttle and lower pumping losses. The stock cold air intake is fine if you don't want the power loss a warm one could cause.
Super and turbo chargers use intercoolers because the compressing will heat the air up higher than ambient without them, which could lead to knocking. When driving for efficiency, the engine isn't going to be pushed hard enough to benefit from an intercooler. Cooled EGR will help, but that is much more difficult to add to a car.