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Old 02-21-2011, 09:09 AM   #3 (permalink)
MetroMPG
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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)
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Without knowing the load conditions under which the transmission will downshift, you won't be able to predict whether this will become a problem.

Which leads me to wonder... how difficult is that final drive swap?

If it's not a huge job, I'd simply aim for the lowest cruising RPM you can get, and try it.
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