Pump up the tires to (close) to the sidewall max -- that is a no-brainer, and it will help it roll better. The upper grill block, for sure, as well. Seal the hood gap at the front with some soft self-adhering foam gasket from your local home center, will also help a bit. Too bad for the open alloy wheels -- they churn the air quite a bit more than steel wheels. Have you considered rear wheel skirts; possible made out of clear polycarbonate?
I'd highly recommend a ScanGauge or an Ultraguage, for that "instant feedback" of how you are driving moment to moment.
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