My civic also gets abnormaly good MPG. I do a mixed average of about 80 % fwy and 20 % intown and it does about 44mpg each time. I have the stock tire size in a long wearing tire, a light weight fly wheel, and intake with open element K&N filter.
If I remember correctly there was a thing about Honda admitting to the odometers in their cars recording more millage than they actually travel. I'm not sure how off they were, but it was enough to cause a fuss on the news.
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