The Honda Civic GX runs on compressed natural gas, which supposedly only costs about the equivalent of $1.25 per gallon of gasoline. Downsides include the tank only holds the equivalent of eight gallons of gasoline, so range is half of the gasoline version. And if you run out between the rare CNG filling stations, you'll need to be towed to one. Plus, you only get 113 horsepower, instead of the 140 in the basic gasoline Civic. And the MSRP is a hefty $24,590, a couple of thousand more than the 110 horsepower Civic Hybrid.My question is whether this is one of those rare cases where it pays more to get in early on a new technology. If 15 years from now, half of America is driving around in a compressed natural gas vehicle, will the current large price gap between CNG and gasoline narrow considerably due to more demand for CNG?