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I had an LPG car a long time ago.
Basically LPG made (some) sense when cars had carbs or single point EFI. Most of today's cars cannot be aftermarket converted. Converting my '05 Jeep to LPG would have cost $6k, not many converters left at those prices.
Anything aftermarket is not as reliable as OEM.
LPG was OK when most people drove sedans with a fixed rear seat, where the tank could go against the seatback, with hatchbacks and SUV's a big tank in the load space is a massive issue, as you loose the ability to fold the seats for large cargo. Spare wheel replacement tanks are small and won't fit most cars with 'space savers' anyway.
Fewer miles per litre, offsets the lower cost of fuel to a degree. As newer cars are more optimised for the intended fuel, aftermarket conversions will lag more and more.
LPG is only popular if it's not taxed like petrol/ diesel. Here it's only taxed at 10c vs 50c (flat rate per litre, not %). If you do the math, at the same tax rate LPG would make no sense.
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