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Old 10-12-2012, 09:46 AM   #10 (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)

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)

Appliance car - '14 Mitsubishi Mirage ES (base)
90 day: 50.04 mpg (US)
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Originally Posted by wmjinman View Post
2) I never dreamed 40 mph would be the "peak efficiency speed". I always thought it would be around 50, with the mpg dropping below that due to "inefficient engine speeds".
That lines up predictably with a broad range of other vehicles that members here and elsewhere have tested, as you did.

Generally passenger vehicles get the best cruising fuel economy at the lowest road speed after top gear is engaged. (Though sometimes at the lowest road speed in second from highest gear, for some vehicles with higher aerodynamic drag.)

FYI, see:

Glad you're having fun with the ScanGauge - I remember being pretty excited by the world of testing possibilities it opened up when I first got mine for my Pontiac Firefly (clone of your Suzuki, with the 1.0L 3-cylinder though).
Project MPGiata! Mods for getting 50+ MPG from a 1990 Miata
Honda mods: Ecomodding my $800 Honda Fit 5-speed beater
Mitsu mods: 70 MPG in my ecomodded, dirt cheap, 3-cylinder Mirage.
Ecodriving test: Manual vs. automatic transmission MPG showdown

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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