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Old 03-02-2011, 11:27 AM   #3 (permalink)
COcyclist
Aero Wannabe
 
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Join Date: Dec 2007
Location: NW Colo
Posts: 738

TDi - '04 VW Golf
TEAM VW AUDI Group
90 day: 52.55 mpg (US)
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Quote:
Originally Posted by vacationtime247 View Post
Like the idea. But for 4 more mpg at 70 mph might also require smooth hubcaps, side wheel skirts and possibly an air dam. Clean up the underside and you'll see even better gains! Good luck.
VT247
I like it and I hope you do it. But I'm with Vacationtime on this one. For highway driving I would do some major grill blocking/air dam to clean up the front end. I have gotten good results from a coroplast belly pan/skid plate combo. You could do these two mods and still have full use of your trunk and back window visibility and you can leave them on the car all the time.
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Quote:
Originally Posted by freebeard View Post
The power needed to push an object through a fluid increases as the cube of the velocity. Mechanical friction increases as the square, so increasing speed requires progressively more power.
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