[elhigh]

I think you'll find the consensus answer here is to change your air intake to something that feeds the engine with warm air, not cold.

Just cruising around, you don't need anywhere near as much power as your engine is capable of making. Feeding it warm air reduces how much air mass it can pull; to avoid over-rich fuel-air mixtures you get shorter injector pulses. But now your engine is making a bit less power, so you run with a heavier foot on the throttle. With the throttle open wider, you have less pumping losses, so in fact your engine is a bit more efficient in this new, warm-intake operating paradigm.

The other stuff makes perfect sense. Get the gases in more easily, out more easily, it all means less wasted power pushing air around, more power available for pushing YOU around - and isn't that the whole point?

No idea on throttle body spacer. If it's cheap, throw it in there and see what happens? I'll tell you now, you do the mod and post your results, people will read it.

By the way - welcome!