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Sounds like an interesting build. Looking forward to the progress.
I think you are a bit mistaken (or I read your post wrong) on how gearing and throttle works. As an engine gets loaded more it operates more efficiently. Having taller gearing tends to load the engine more thereby increasing efficiency. So, you want to have to use a lot of throttle. I believe the manual trans from the 4 door is the one you want to use because of this, though I am no Metro expert.
Anyway, I don't think you'll have much problem hitting 50 mpg if you combine your modifications with some good driving techniques.
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