View Single Post
Old 03-05-2012, 12:55 PM   #7 (permalink)
MetroMPG
Batman Junior
 
MetroMPG's Avatar
 
Join Date: Nov 2007
Location: 1000 Islands, Ontario, Canada
Posts: 22,124

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

MPGiata - '90 Mazda Miata
90 day: 53.56 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: 64.03 mpg (US)
Thanks: 3,756
Thanked 6,569 Times in 3,405 Posts
Quote:
Originally Posted by kingsway View Post
But to my great suprise, when I did the cost-down test again, from 50 to 40 mph, instead of slowing in 14 seconds, it took nearly 20 seconds!!! (I repeated the test several times)

Now, it was just a quick and dirty test - with no account of wind (although the air did seem fairly still)
Wow. That seems really encouraging!

If I were you, I would want to do the test under identical conditions (excuse me if my reading of your test is wrong - I got the impression you did your coast downs on different days). I'd want to be sure the effect is from the mod, and not something like a tailwind or the wake from vehicles ahead of you, or ???, etc.

Why? Whenever I do a mod, I always say to myself: "there is a remote possibility this mod could in fact be making things worse." The only way to know for sure is to do the best test possible and be careful I don't accidentally deceive myself into leaving a bad mod on the car!
__________________
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
  Reply With Quote
The Following 2 Users Say Thank You to MetroMPG For This Useful Post:
Sven7 (03-20-2012), Tango Charlie (03-06-2012)