Fun car that can be a "Jack of all trades, master of none".
Not specifically for ecodriving, but that will be factored into the final concept.
Lowered on coilovers ~-10lb over stock
Front splitter, lighter wheels, manual gearbox with very tall last gear, Engine rebuilt with forged/lighter parts, turbo, tuned for power and for eco driving. Metal underbody. Carbon trunk, carbon hood, carbon driveshaft, lighter seats without motors. Delete sunroof.