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Old 05-09-2022, 11:35 AM   #2 (permalink)
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Join Date: Nov 2007
Location: 1000 Islands, Ontario, Canada
Posts: 22,451

Blackfly - '98 Geo Metro
Team Metro
Last 3: 70.09 mpg (US)

MPGiata - '90 Mazda Miata
90 day: 55.97 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: 67.41 mpg (US)
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Bienvenue, Benjamin!

I've changed your account so you can now post links/pictures.

As for your question about tires:

If the old tires are NOT low rolling reisistance, then you will notice a big difference in how easily the car coasts in neutral. That can save you a few percent in your fuel use. It can save you MORE than a few percent if you can change your driving techniques to take advantage of opportunities to coast longer before turns & stops. (Depends on traffic, too.)

Torque mapping:

As for changing engine characteristics, my feeling is that would be most useful if it allows you to change to top gear sooner than you can now.

Similar situation: I installed an "economy" camshaft in my gasoline engine that makes more low-end torque, so I can up-shift earlier.
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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