With the clean nature of the fuel, maintenance on the GX is much lower than on a gasoline-powered car. Oil changes are around 10,000 miles. Tune-ups are required at somewhere above 100,000 miles. Without hydrocarbon fuel (gasoline/diesel/etc) there are no carbon deposits in the engine, eliminating the need for valve jobs and greatly reducing cylinder and ring wear. The engine should last well in excess of 500,000 miles with proper vehicle maintenance. The GX still qualifies for Diamond Lane access in California.
especially for anti cng gang.....
source: http://en.wikipedia.org/wiki/Civic_GX