An internal combustion can burn gas and CNG (or propane). All that was necessary to allow the switch from one fuel to another was some additional plumbing and calibration of the car’s ECU (the computer that makes air-fuel ratio adjustments and so on).
So, no worries about running empty – and no waiting for hours to refuel.
Three, CNG was (is) cheap and burns very cleanly and is massively abundant right here in the U.S. At a stroke, the three major charges leveled against the pure-gasoline-burning car are vacated. The CNG car hardly pollutes and it greatly reduces and potentially eliminates dependence on “foreign” oil. Also, the cost of the CNG car itself was within reason because no uber-elaborate technology was necessary (unlike electric cars and hybrid electric cars). Just some modifications to an existing car. Sure, there were some issues to be sorted out – the big one being making it easy (and safe) for the average person to refill the CNG tanks. But the technology of the car itself worked – and was economic.
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