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Old 02-17-2008, 08:03 PM   #2 (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: 52.71 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: 60.06 mpg (US)
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The main reason the mileage went down in '95 and up is because the body style changed, and the cars got significantly heavier.

I doubt there's any difference between the '94 ECU and the '95 ECU. In '96 the cars got OBDII, that's where the biggest difference would be seen.

Here's my advice:

Keep the '99 ECU specifically because it will permit you to use a ScanGauge in the vehicle (the SG requires an OBD2 computer). Using a ScanGauge to fine tune your brain and right foot will reduce your fuel consumption dramatically more than any ECU swap you could possibly make!
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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