 The GX followed the same model year design changes as the Civic LX model, until the model year 2001 when a CVT (continuously variable transmission) was introduced in place of the 4-speed automatic transmission.In the 2006 year model, the GX again was equipped with the automatic 5-speed transmission, which improved its fuel economy and extended its range to 250 miles.In 1998 the GX was available for special order in some states to consumers, California and Colorado in particular.