The older civic has a slightly dropping roofline before it cuts off, while the new one drops off at the highest point. Bigger rear wake.
Did all the 96+ hatchbacks have that spoiler? If not, air is being dragged down the rear window at the absolute worst angle - about 30 degrees. Either one, a steeper cutoff or a shallower angle, would be better.
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11-mile commute: 100 mpg - - - Tank: 90.2 mpg / 1191 miles
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