Those figures are from the 1970s, when presumably there was a lot more low-hanging fruit. Still, I wouldn't be surprised if they invest a decent chunk into computation aerodynamical work as part of their body design.
You’re also touching on a rather large ignored issue in this article, that this NASA truck aerodynamics project was directly connected to the 1973 oil crisis and a government wide effort to reduce oil consumption, not just some epiphany by some guy on a bike.
You’re also touching on a rather large ignored issue in this article, that this NASA truck aerodynamics project was directly connected to the 1973 oil crisis and a government wide effort to reduce oil consumption, not just some epiphany by some guy on a bike.