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Simples just go buy a car that starts with world class CDx, less than 6 SqFt.
from the Wiki
CdA sqft CdA m2 Automobile model
2.04 sq ft 0.190 m2 2011 Aptera 2 Series
2.10 sq ft 0.195 m2 2013 Urbee 2[
2.50 sq ft 0.232 m2 1986 Twike
2.54 sq ft 0.236 m2 2002 Opel Eco-Speedster
2.69 sq ft 0.250 m2 2009 Loremo
2.784 sq ft 0.2586 m2 2010 Edison2 Very Light Car
3.00 sq ft 0.279 m2 2011 Volkswagen XL1
3.95 sq ft 0.367 m2 1996 GM EV1
5.00 sq ft 0.465 m2 2005 Mercedes-Benz Bionic
5.10 sq ft 0.474 m2 1999 Honda Insight
5.40 sq ft 0.502 m2 1989 Opel Calibra (8 valve)
5.58 sq ft 0.518 m2 1993 Mazda RX-7 FD (base model)
5.70 sq ft 0.530 m2 1985 Subaru Alcyone/XT/Vortex
5.71 sq ft 0.530 m2 1990 Honda CR-X Si
5.74 sq ft 0.533 m2 2002 Acura NSX
5.76 sq ft 0.535 m2 1968 Toyota 2000GT
5.80 sq ft 0.539 m2 1986 Toyota MR2
5.81 sq ft 0.540 m2 1989 Mitsubishi Eclipse GSX
5.86 sq ft 0.544 m2 2001 Audi A2 1.2 TDI 3L
5.88 sq ft 0.546 m2 1990 Nissan 240SX / 200SX / 180SX
5.90 sq ft 0.548 m2 2015 BMW i8 [142]
5.92 sq ft 0.550 m2 1994 Porsche 911 Speedster
5.95 sq ft 0.553 m2 1990 Mazda RX7
5.96 sq ft 0.554 m2 1993 Mazda RX-7 FD R1(R2)
The first 9 on the list are rocking horse poo and unicorn horns. Others like the Toyota 2000GT are £1 million and/or very rare, less than 1000 Porsche speedsters. The i8 is a bit expensive to start chopping around.
Then make a choice between 2 seat or 2+2. But beware of the 8 valve Opel Calibra it's only got 1/2 a cooling system so most of it's advantage over the 16V/turbo/V6 models is cooling / engine bay drag. Honda Insight also has small radiator with blanking plate.
Mazda RX7 FD appears 3 times with different "aero" trim. So now you have a choice of about 10 cars.
Lowering a car only reduces the frontal area by the area of the tyre that is hidden. 25mm drop with a 205mm tyre = 4 x 0.205 x 0.025 = 0.02 m².
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