Sorry, I forgot your question about the intake -- I do have the so-called cold-air intake, but I don't think it matters very much.
Fiberglass is not very expensive, really; though it takes a bit of time. Check out the Insight boattail that 3Wheeler made; and there are other outstanding fiberglass mods.
Your automatic has the 3.56:1 final drive, I think?
Do you have a ScanGauge or the UltraGauge? If not, you will really get a lot of value from them. Coasting in neutral is a fine way to get 100-350MPG while you can. A grill block and smooth wheel covers would give a lot of benefit, and rear wheel skirts can be done "properly" with screw mounts and finished looking panels.
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