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My thoughts on the rear spoiler is leave it alone. It is already there and if you remove it you will have to fill the holes and repaint the rear deck $$$. It isn't going to affect your gas mileage that much. If the car didn't come with one then I would say no to adding a spoiler.
Look at filling the engine and transmission with synthetic. Also doing at least a 25% grill block will help highway mileage. Look on Mitsubishi performance web sites and forums to see if there is a cheap OD gear change available. I'd bet your Lancer has a relatively low OD gear (Performance) compared to other Mitsubishi's with the same transmission.
I don't know about Mitsu's transmissions but with some Honda's it is a pretty easy mod.
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