Is your Metro a 5 speed with the 1.0L 3 cylinder? You should be able to get 50MPG with that car by now. How does it run? Have you performed a compression test on all the cylinders to see if the engine is in need of internal repairs?
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What ratio trans did you remove, and what do you have now?
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The 95+ 3 cyl 3-door hatchbacks got the 4.39 and I replaced mine with the same trans from a 1999 with 89,000 miles on it from a local junkyard. It was actually the only place in my area that had one available.
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Does you new-found fuel mileage include any big speedo/odo calibration errors?
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Not possible. Same trans and no noticed errors after initial drive.
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How fast do you typically drive?
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This is where I get my fuel mileage. My route is a 55MPH country road for 80% of my trip. I usually drive anywhere from 50-55 on this road and keep a steady throttle the whole way. No Interstate travel.
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I read the entire thread, did you change the cam (to and XFi-type)
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I did not change the cam, but experimented with drilling holes in a spare cam gear to do timing advance (not the same as ignition advance) and found that I screwed the drilling up and was way off on my reading.
I took my spare cam and tried to estimate 6-8 degrees advance using a protractor and drilling a hole 186 degrees and putting the cam on backwards, but CoyoteX mentioned on another thread that 8 degrees would be a half tooth and when re-measuring my previous hole, I was like 2 teeth to far. I drilled and slotted another hole just past the original line-up hole, but never tried it out since I am actually afraid that something may go wrong and I cannot afford to have the car go down.
I plan on doing more aero modifications before doing anymore engine tweaks. So far in the works I have planned.............
Grill Block
Underbelly pan
Fender skirts