Where to start? An attitude adjustment of the nut behind the wheel is free. The air in the tires can be free with a bicycle pump.
What you are asking for is ROI (return on investment); consider it a search term. You can't manage what you can't measure ==> Scan/Ultra Gauge/Arduino/
Raspberry Pi reTerminal.
ecomodder.com/wiki/Vehicle_Coefficient_of_Drag_List
Quote:
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Ford Mondeo 1996 - 2000 Cd=0.31 frontal area=22.06 CdA=6.89
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Modifications fall into airframe and powerplant. Changes in one can mandate changes in the other.
The Journey Is The Reward - Tao Te Ching Quote