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The automatic in the 1990 CRX is EPA rated at 25/32mpg while the 1987 crx hf is EPA rated at 42/51mpg.
letting anyone removed any of the vacuum lines from a Honda carburetor is a bad idea, it's a whole system that is designed to work as a whole, so if something is missing then walk away.
There are a few things to learn to do with the carb on a honda, but if it's working well and left alone then most of the time they are just fine, avoid low grade gas.