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Old 03-12-2012, 04:43 PM   #11 (permalink)
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Location: 1000 Islands, Ontario, Canada
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Blackfly - '98 Geo Metro
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Last 3: 70.09 mpg (US)

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90 day: 55.97 mpg (US)

Even Fancier Metro - '14 Mitsubishi Mirage top spec
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I wonder if it's a faulty MPG calculation.

You need to completely fill the tank to be able to figure MPG accurately. It sounds like you're just adding 10 or 20 at a time and trying to figure it out from there, which is not precise at all.

See: http://ecomodder.com/forum/showthrea...rmula-352.html

Project MPGiata! Mods for getting 50+ MPG from a 1990 Miata
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has launched a forum for the efficient new Mitsubishi Mirage
www.MetroMPG.com - fuel efficiency info for Geo Metro owners
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Old 03-12-2012, 09:52 PM   #12 (permalink)
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When In doubt change the O2 sensor , they are pretty cheap on Ebay . also the plugs, When ever I have trouble now I just go through the basic stuff that's cheap first , otherwise you go right past the problem, often while changing normal tune up items, I find things wrong but it still runs, How is the PCV valve, they plug up believe it or not ,mine did and blew out the valve cover gasket. could even be low baterry voltage, new cars and old need the full 13 volts to run good.
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Old 03-13-2012, 01:09 AM   #13 (permalink)
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A friend with a different car than that had lost power and FE, it turned out to be the O2 sensor. It did not start running right immediately after changing it. It took about 60 miles for the computer to catch up and get the fuel trim back in line. After that it ran fine.

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