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Ive heard about the valves in the intake to change the length of the runners. And what you were saying about the harmonics makes sense.
So ideally what you would want to do is make it so your runner length would end up so that at the rpm where you are cruising down the highway you would have a harmonic effect that would help get air into the cylinder. But would this really help economy? If you had more air in the cylinder and the same amount of fuel then you would end up with a lean condition. Therefore the o2 sensors would add more fuel to be closer to stoich.
Im pretty sure that I have the same motor as you Christ have you ever looked into the runner length on that motor? Or is yours the older style intake manifold?
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