A problem with rubber is that it can bend too much or worse, wobble and oscillate under airflow and that can create more turbulence than you may care for.
Since you've go so much of the front belly panned, a front air dam is probably not necessary. Front/side/rear wheel fairings might be helpful but conversely will entail more work on your part. (My Scion also has those little tabs ahead of the front wheels -- also a mini pan under the fender)
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My 5 pillars of fuel efficiency:- driving style
- aerodynamics
- tires
- weight reduction
- engine maintenance
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