EPA mileage on your car is 52mpg so you might just check things over and make sure that it's still all working correctly, engine speed at 65mph should be around 2,000 RPM if you have the correct transmission.
The civic VX engine is also fussy enough about tuning that after market exhaust and intake and so on only hurts mileage, I'm on my 2nd civic vx with over 210,000 miles now and have been the most impressed with stock OEM parts.
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