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Though the 2012 Honda Civic is a decent car overall, I don't think the natural gas version is a worthwhile purchase because it forces too many compromises. For one, the gas tank uses up nearly all the trunk space -- just six cubic feet of space remain, compared to 12.5 cubic feet in a regular Civic sedan. In addition, the Civic Natural Gas is very slow because it weighs between 53 and 247 pounds more than other Civic sedans, yet the 1.8-liter engine produces only 110 hp, compared to 140 hp in gasoline-fed models.