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Why the 1969 Dodge Charger Daytona’s Spoiler is So Tall
https://www.heacockclassic.com/articles/why-the-1969-dodge-charger-daytonas-spoiler-is-so-tall/

The 1969 Dodge Daytona, and corporate sibling the 1970 Plymouth Superbird, were special edition vehicles manufactured by Mopar to compete mostly in NASCAR. Designed in a wind tunnel and boasting a 0.28 drag coefficient, the Daytona’s styling was bold, to say the least

Aerodynamics and Efficiency Through the Air – Honda Insight, Toyota Prius, and Chevy Volt :: Auto Upkeep Blog

The lower the drag coefficient the better. The lower the number the more aerodynamic the vehicle is cutting through the air which helps in increasing fuel economy.

GM engineers concede that Toyota achieved 0.25 for the Prius on their wind tunnel, but as they point out “its really all relative to what tunnel it was tested on”. See GM’s statement.

Just for fun, check out this Wikipedia article listing the coefficient of drag for many vehicles. A 2003 Hummer H2 had a rating of 0.57, whereas a 1996 GM EV1 0.195.