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I agree with FXSTI on both counts,1. removing your cat might make your sensors read lean, and your computor will richen your fuel ratio, killing your mpg. 2. you haven't mentioned any changes in driving habits, which is where your biggest gains will be. I would recommend replacing your cat, and then read up on some of the hypermiling tips found on the home page. don't give up though, 2 mpg is better than nothing.
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