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Old 09-13-2017, 09:34 AM   #155 (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: 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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Last night: so I couldn't for the life of me locate the timing mark on my crank pulley -- it's a TINY engraving, and the accompanying paint mark disappeared long ago.

So instead I changed my gearing...

That's a 15 inch Civic rim that my neighbour had laying around. Tire size is 185/65R15, the same width but larger diameter than the factory 185/60R14 tires. I've got them on the rear axle only.

RPM difference @ 80 km/h (50 mph):
  • OEM: 2587 RPM
  • NEW: 2404 RPM

Difference in rolling resistance? Unknown!

Difference in aero drag? Unknown! (It raised the rear of the car by about 3/4 inch).

Difference in rotational weight? Unknown!


Back to timing... I did end up finding the wee timing mark this morning using the "find TDC with a screwdriver through the spark plug hole resting on top of the #1 piston" method. So I'll get to advancing the timing soon enough.
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Project MPGiata! Mods for getting 50+ MPG from a 1990 Miata
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Mitsu mods: 70 MPG in my ecomodded, dirt cheap, 3-cylinder Mirage.
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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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