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Welcome to the site.
According to fueleconomy.gov the Fiero should get mid 20s with the 2.5L 4 cylinder, and low 20s with the 2.8L V6. I don't think you should have a world of trouble getting low 30s out of it, especially if its a manual trans.
Maybe we can help you diagnose the problem. Let us know what is wrong with it.
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