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Old 07-20-2008, 05:10 PM   #2 (permalink)
azraelswrd
Mr. Blue Tape
 
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Join Date: Jun 2008
Location: Fresno, CA
Posts: 345

AzxA - '06 Scion xA
90 day: 42.72 mpg (US)
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Experimentation and tuft testing may help in figuring out the size and angling, though an oft-cited resource is Hucho's book on aerodynamics. Search for it on Amazon.com. It's massive (both price and size) but it has those "magic numbers" you're looking for.

If you're lucky maybe your local free library has one....
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My 5 pillars of fuel efficiency:
  • driving style
  • aerodynamics
  • tires
  • weight reduction
  • engine maintenance
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