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Old 02-27-2012, 10:05 AM   #4 (permalink)
MetroMPG
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Join Date: Nov 2007
Location: 1000 Islands, Ontario, Canada
Posts: 22,234

Blackfly - '98 Geo Metro
Team Metro
Last 3: 70.09 mpg (US)

MPGiata - '90 Mazda Miata
90 day: 52.07 mpg (US)

Winter beater Metro - '00 Chevrolet Metro
90 day: 61.98 mpg (US)

Fancy Metro - '14 Mitsubishi Mirage top spec
90 day: 58.72 mpg (US)

Even Fancier Metro - '14 Mitsubishi Mirage top spec
90 day: 70.75 mpg (US)
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Quote:
Originally Posted by yostumpy View Post
Wallace has a full safari type roof rack fitted which I do use some times, and I'm thinking of cutting off the side upstands 75mm so that its flat, and then cutting it into 3 parts, with the 3 legs at the rear staying on, the middle section thrown away, and the front 3 leg section easily removable, and place where its needed. but as I use the truck for work. Do you think the partial removal will improve matters? I know its not the best testing ground in the world, as my driving is rarely a repetative commute.
A photo is worth some words. (Google image search for your rack style might help us understand what you're suggesting.) It's worth taking off a roof rack when not needed. You will decrease both frontal area and drag coefficient of the truck.

Savings will vary. EG: you can see a ~3% change here: http://ecomodder.com/forum/showthrea...-6-a-6069.html

People can be funny about roof racks -- "removal-phobic". (Not saying that you are.)

I once recommended to a friend that he remove the rack from his new-to-him small hatchback car. (Keep in mind this friend is the type of person who is perpetually in debt and always complaining that he needs to find ways to economise.) I even did the math for him, pointing out how much gas and therefore money he'd save in a year (I think it was around $60). But he wouldn't take it off. Why? "Just in case" he needed to use it, it would have been a fussy job to re-install. I don't believe he ever has used it. That was about 3 years back, so $180 worth of fuel burned for nothing!

Anyway - welcome to the forum. Good luck with your efficiency efforts.
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Honda mods: Ecomodding my $800 Honda Fit 5-speed beater
Mitsu mods: Oops, I did it again! Bought another cheap, 3-cylinder Mirage. Mods in progress...
Ecodriving test: Manual vs. automatic transmission MPG showdown



EcoModder
has launched a forum for the efficient new Mitsubishi Mirage
www.MetroMPG.com - fuel efficiency info for Geo Metro owners
www.ForkenSwift.com - electric car conversion on a beer budget
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