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I too would recommend investing in a Scangauge or similar instrumentation hardware. Having instantaneous fuel economy feedback is invaluable, especially for testing mods. I have mine set to intake temp, coolant temp, instant MPG and trip average MPG, but there are a lot of other options to choose from as well.
As for aero mods, the front grill block is probably the easiest mod to perform. Other big-gain mods you can try are wheel skirts (start with rear wheels as those are typically easier to skirt) and an underbelly pan. If you add those, you should have no trouble getting 50 mpg and above.
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