maybe they already spend more attention on such details wich is why they get better milage.
ironically the more sloppy your base model is the more chance car makers have to bragg about these "special" tweaks that save gass, while of course they should have done these things in the first place.
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aer·o·dy·nam·ics: the science of passing gass
*i can coast for miles and miles and miles*
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