I think the critical pressure of the different gases is interesting to note when comparing lighter gas(butane), petroleum gas(propane) and methane
Every gas has a critical temperature. If the temperature of the gas is over this critical temperature, no amount of pressure, however great, can liquify the gas.
Lighter gas(butane) has a critical temperature of 152 Celcius, propane has a critical temperature of 96.6 Celcius. This means that liquefaction of these gases in lighters or in lpg tanks of cars is no problem at normal outside temperatures.
Methane is a totally different story, it has a critical temperature of -82,7 Celcius. This means that liquefaction is impossible in a car, only compression is possible.
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