Just to add to what unkated mentioned, conversion is not as difficult as you might think. Here in Australia where our fuel prices are typically double or triple what you pay in the USA, the conversion of cars to LPG is quite common and it's been happening for decades.
For example, during the mid-80s my father was a courier driver and he had his van converted to bi-fuel (petrol & LPG). For engines made before the introduction of complex computerized management systems, engines can be converted to bi-fuel by most competent mechanics.
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