09-10-2012, 09:32 PM
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#1 (permalink)
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Ultimate Fail
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A 20% reduction in drag = a 10% increase in fuel economy ?
So I seem to remember it being said that a 20% reduction in drag = a 10% increase in fuel economy above 55 mph .
Is this correct ?
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09-10-2012, 09:35 PM
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#2 (permalink)
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Master EcoModder
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Yes
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09-10-2012, 09:44 PM
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#3 (permalink)
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intredesting... 
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09-10-2012, 09:45 PM
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#4 (permalink)
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Ultimate Fail
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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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09-10-2012, 09:58 PM
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#5 (permalink)
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EcoModding Smurfer
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If you can take your Cd down to 0.124, then you should be getting a LOT more than 54MPG.
0.124 is ... ridiculous.
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09-10-2012, 10:10 PM
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#6 (permalink)
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Ultimate Fail
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Quote:
Originally Posted by Smurf
If you can take your Cd down to 0.124, then you should be getting a LOT more than 54MPG.
0.124 is ... ridiculous.
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Right. I'm doing the math wrong . |
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09-10-2012, 10:36 PM
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#7 (permalink)
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Aero Civic is ~0.17
95mpg at 65mph
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09-10-2012, 10:46 PM
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#8 (permalink)
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Ultimate Fail
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Quote:
Originally Posted by Sven7
Aero Civic is ~0.17
95mpg at 65mph
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That's what I'm not understanding .
How much of that number is due to aerodynamic modifications, versus coasting along in neutral with the engine off ? |
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09-10-2012, 11:10 PM
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#9 (permalink)
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Master EcoModder
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Quote:
Originally Posted by Cd
That's what I'm not understanding .
How much of that number is due to aerodynamic modifications, versus coasting along in neutral with the engine off ?
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Basjoos has his fuel /speed number on the forum somewhere - I think in his aerocivic thread about dropping its cd to around 0.17 .
His figures were with steady state driving IIRC - using lean burn though.
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09-11-2012, 04:13 AM
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#10 (permalink)
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Ultimate Fail
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I'm miserably bad at math, so please check my numbers .
.31 Cd minus 45% equals .1705
45 MPG plus 110 % equals 94.5 MPG
So a reduction of 45% in drag equals a 110% increase in fuel economy ?
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