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EPA rating for the civic dx with the automatic is 24/32mpg, Honda's don't tend to like after market air intakes so that is going to drop it down right there, same with an over sized exhaust, so look under it to see what else has been screwed with.
It would be well worth you getting a scan gauge, not only for improving your driving style but for checking things like engine coolant temp, if it's going into closed loop and that everything else is running right.
Flushing your transmission and doing a full tune up could be worth while as well.
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