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Old 09-05-2012, 10:59 AM   #3 (permalink)
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Join Date: Nov 2007
Location: 1000 Islands, Ontario, Canada
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Blackfly - '98 Geo Metro
Team Metro
Last 3: 70.09 mpg (US)

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90 day: 52.8 mpg (US)

Winter beater Metro - '00 Chevrolet Metro
90 day: 73.57 mpg (US)

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single-use to save less than $7 ... worth it?

Is it really worth the effort for one 250 mile trip?

How much time & work are you willing to invest to save less than seven dollars? (I'm assuming saving money is your goal.)

The math:
  • You'll use 17.86 gallons @ 14 mpg (250 miles / 14 miles per gallon)
  • Let's say you improve your fuel economy a reasonable 10% with a quick & dirty aero shell.
  • That means you'll save 1.786 gallons, or $6.79 at $3.80/gallon.
You could probably save more than that just by choosing an alternative route that lets you drive slower without disrupting traffic.

I think Sven's advice on the half-tonneau is a good compromise on return on investment for this case. Could probably slap something together out of used building materials in 15 minutes. Throw on a partial grille block, fold back the passenger mirror, etc., etc., etc.

(PS - I also read recently that the bed needs to be enclosed under that rear half-tonneau for best effect, meaning: there needs to be a vertical piece at the forward end between the bed and the tonneau.)
Latest mods test: 15 mods = 15% MPG improvement: A-B test, 2007 Honda Civic 1.8L, 5-speed
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Manual vs. automatic transmission MPG showdown: Nissan Micra 1.6L

has launched a forum for the efficient new Mitsubishi Mirage - fuel efficiency info for Geo Metro owners - electric car conversion on a beer budget
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