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Besides it being illegal, you SHOULDN'T for several reasons.
Todays cars use a pressurized fuel system, if the ignition is on while the cap is off it will throw a check engine code due to loss of pressure.
Gas in liquid volume is not as flammable as many people think. You can toss a cigarrette in a 5 gal bucket of gas and it will just go out.
However, gas evaporates VERY quickly and is VERY volatile. You run a greater risk of explosion from holding a cigarrette NEAR a bucket of gas than you do throwing it into the gas. If your gas cap is open, there's a MUCh greater risk of explosion from any errant spark contacting the gas vapours.
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