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Old 04-16-2010, 05:55 PM   #9 (permalink)
Frank Lee
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Join Date: Jan 2008
Location: up north
Posts: 12,735

Blue - '93 Ford Tempo
Last 3: 27.29 mpg (US)

F150 - '94 Ford F150 XLT 4x4
90 day: 18.5 mpg (US)

Sport Coupe - '92 Ford Tempo GL
Last 3: 69.62 mpg (US)

ShWing! - '82 honda gold wing Interstate
90 day: 33.65 mpg (US)

Moon Unit - '98 Mercury Sable LX Wagon
90 day: 21.24 mpg (US)
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Quote:
Originally Posted by eco86 View Post
Seeing as modern vehicle mirrors have been shown to account for between 3 and 6% of the total drag on a car, I would think that deleting mirrors to hit CAFE standards would make sense. Not necessarily both mirrors, but even deleting one mirror would improve the aerodynamics of a vehicle (like the Civic VX and Metro XFi).
Plus, 3-6% is a pretty large gain. Adding variable valve timing is quoted as improving EPA fuel efficiency by 5%, and turbocharging is quoted as improving FE by 7.5% *. Redesigning an engine to add a turbo, or VVT, or direct injection is much more expensive than deleting mirrors and adding cameras in their place. Just my $0.02.

*FE statistics found at Fuel Economy
Engine Technologies

3 to 6% drag reduction does not equal or lead to 3-6 more mpgs or even 3-6% more mpg.
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