Quote:
Originally Posted by Cd
So if I take my 1993 Civic hunchback with a stock Cd of .31 and drop the Cd by 60% down to .124 , then my fuel economy will rise by 30% ?
42 MPG highway + 30% = 54.6 MPG ?
( yes - I completely FAIL at math )
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*If you drop the Cd from 0.32,to 0.124 you have only 38% of your original drag remaining.
*This required a 62% drag reduction to get there.
*At 55 mph,a 10% delta-Cd = 5% delta-mpg.
*Dividing 62% by 10% leaves 6.2 X 5%,or 31% mpg increase.
*So,1.31 X 42= 55.02 MPG @ 55 mph.
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*If you get 42 mpg at 70 mph you pick up 6% mpg per 10% delta-Cd
*So 62% divided by 10% = 6.2
*And 6.2 X 6% = 37%
*Then 1.37 X 42 = 57.54 mpg @ 70 mph.
