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At 22 MPG there's not much you can do to improve the drivetrain. I would not spend time or money on intakes or electric fans, etc. Aero mods would be the best bang for your buck.....I agree with the front air dam, but a well designed, light weight aero cap will give you the best drag reduction by far. In the most reliable studies there is a minimal gain with a tonneau (half or full), but a significant gain from the areo cap with a 10-12 degree slope (even more so with compound slopes).
Of course a lot of this depends on the type of driving (speed, traffic, etc) you do.
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