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Old 09-08-2020, 12:58 PM   #321 (permalink)
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New best tank = 55.6 MPG




MPGiata gets a new tank record: 55.6 MPG = 4.2 L/100 km. I'm callin' that 56.

New mods this tank:

- lowered suspension about 1 inch
- ... which lowered the existing air dam as well
- side skirts
- revised variable grille block, which I used more regularly than the previous version

I was a little surprised by the result considering this tank included some kayak-on-the-car trips.

--

Further thoughts on lowering:

I've scraped the air dam on a bunch of stuff, but no epic hits yet. (Though I did dodge some rather large roadkill that would have been a problem!)

Also, a portion of this weekend's road trip included a stretch of highway with pretty poor (broken) pavement, and that was fairly harsh. But not quite badenough to make me want to undo the change unless all the roads I drove on were that bad.


My friends' cottage is on an "unserviced" (to put it mildly) coarse gravel road with lots of dips, bumps & ruts. (They drive a Jeep.) I seriously considered parking at the end and walking in, but the car made it without serious incident. Video game steering technique!




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Old 09-08-2020, 02:28 PM   #322 (permalink)
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What is "video game steering"?
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Old 09-08-2020, 03:13 PM   #323 (permalink)
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We are operating at an overall mechanical efficiency of only four percent… Therefore, we find that if we increase the overall mechanical efficiency to only twelve percent we can take care of everybody. That three-fold increase in the overall efficiency can only be accomplished by redesign. – R. Buckminster Fuller

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Old 09-08-2020, 05:14 PM   #324 (permalink)
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Think Frogger, but a Miata dodging potential air dam smashers instead of a frog dodging traffic. Left! Right! Right! Left!
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Old 09-09-2020, 05:01 AM   #325 (permalink)
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1m^3 of space filled with helium will make your vehicle lighter by 1 kg. (Air is approx 1.25kf/m^3 and He is 0.25)
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Old 09-09-2020, 07:29 AM   #326 (permalink)
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Quote:
Originally Posted by MetroMPG View Post
Since I dont use this car in the winter, I'm OK with drilling little holes underneath for mounting brackets, in this case for the skirts.

Imagine my surprise when I punctured the right side rocker panel:




It ran for a surprisingly long time! Maybe a cup or 2 of water came out.

I'm not sure how the rocker is supposed to let rainwater out (or how it gets in), but this one is obviously blocked... or used to be.
There are drain holes on each side of the jacking points on the rocker seam. Too bad everybody closes them, then the rockers rust from the inside out
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Old 09-09-2020, 09:03 AM   #327 (permalink)
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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)

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Thank you! I'll take a look. Are the drains at both the front and rear jacking points?
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Old 09-10-2020, 05:17 AM   #328 (permalink)
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Yes, at both front and rear jacking points:
https://forum.miata.net/vb/showthread.php?t=587454
https://forum.miata.net/vb/showthread.php?t=311489

You should also unclog the rain rail drains (top access hole is visible in the first link)
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Old 09-10-2020, 08:35 AM   #329 (permalink)
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Join Date: Nov 2007
Location: 1000 Islands, Ontario, Canada
Posts: 21,712

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: 66.29 mpg (US)
Thanks: 3,443
Thanked 6,267 Times in 3,240 Posts
Thanks again! Looking outside, the car is being rained on as I type. When it dries up, I'm going to investigate.
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Latest mods: 3-cylinder Mitsubishi Mirage. EcoMods now in progress...
Ecodriving test:
Manual vs. automatic transmission MPG showdown



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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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Old 09-10-2020, 11:05 AM   #330 (permalink)
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Quote:
Originally Posted by MetroMPG View Post
Thanks again! Looking outside, the car is being rained on as I type. When it dries up, I'm going to investigate.
Worth poking at them with a pipe cleaner, or since you're not using it over winter, a screwdriver. Mine relieved itself all over my garage floor when I did that. Luckily it was a dry-weather car and it had just gathered a bit too much during a wash so the water was nice and clean, but a good reminder that they get a little clogged...

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