It's not advisable to keep a can of gas in your car... too easy for a fire to result in the event of a crash.
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additionally modern cars have an electric fuel pump in the gas tank. The gas is not just fuel, but also helps the fuel pump cool. Run out of gas and you can ruin a fuel pump by continuously cranking the engine. Some recommend never letting your tank get below about 1/8 tank to keep enough fuel to cool the pump. Just keep some gas in the car.
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