 While Honda claims an estimated 225–250 miles from a full CNG tank, independent tests have found lower ranges of 180–200 miles and "just over 200 miles" (about 300 km).There were improvements in the 2012 EPA fuel economy as the range increased to 225~250 miles.The EPA rates the 2009 Honda Civic GX at 24 equivalent miles per gallon (MPG) city and 36 equivalent MPG highway.