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help ecomodding a saturn ion
the car: a 2007 saturn ion. currently, with some engine mods and a tune, I get 37-44 MPG highway as opposed to the EPA estimate of 34. I do drive on the slower side of things as long as I am not fighting a deadline, but am looking for more MPG for my buck. this car cannot be drilled into for any of my mods, as most of it is polymer, and I do not want to accelerate chassis rust (I lived in the rust belt, and plan on doing so again in the future). the car is relatively clean underneath, and has an air dam, but was wondering if anyone sees the need for a belly pan/deflector anywhere. I am also looking for ideas to keep the rear bumper from being a sail. as far as the rest of it goes, I was thinking of fairing the headlights, somehow filling the grills to make them aerodynamically clean (at least except summer), fairing the rear wheels (and front wheel gap a little?), and somehow filling the large body gaps. I am looking for ideas on how to cheaply and effectively accomplish all of this, what materials to use and what might make a difference and what most likely will not. if it is cheap/ easy to do, but might or might not make a difference, I would still like to try it and receive suggestions.
I have included pictures for reference.
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