They could start by removing roof racks lol.
Make undersides of cars smooth.
Make back of car shorter than the middle, narrower as well.
Clutched A/C and PS or EPS.
Aluminum hood or trunk or more.
Shorter front section of car (steeper nose)
Cars can be shorter in general too
Beefy starters w/ capacitor banks and an auto-stop feature similar to G1 Insight
*EDIT*
Since joining this site every time I drive, every car I look at, I analyze the back of the vehicle and critique its aerodynamics.
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