Welcome to the forum.
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I know my air filter could be changed but i have been blowing it out every so often.
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Believe it or not, a dirty air filter will have a
little to no effect on fuel economy. Long gone are the days when a dirty filter accidentally resulted in an enriched air/fuel mixture (pre-computer monitoring - e.g. OBD). Even with a dirty filter, at part throttle openings (ie. at low/mid load engine operation), the throttle plate is the major restriction.
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Some things that caught my eye are under body aerodynamics, grille blocking, and rear diffusers. All pretty subtle if done right.
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Those all sound reasonable. I'd start with the partial grille block (easiest), and monitor engine temps as you progressively tune it for best effect. Do you have a way to accurately monitor coolant temps (digital gauge)?