The other reason a match or cigarette doesn't ignite a full container of gasoline is that the liquid has enough heat capacity to extinguish the small flame by cooling it without raising the gasoline above the ignition pont.
Most of the information you will find on flammable liquids will use flammable limits and explosive limits interchangably.
It's not that there's no oxygen in the tank space that prevent's an ignition it's that there's not enough. For gasoline with a UFL/UEL limit of 7% (by volume in air) to reach the UFL/UEL in the tank would require that the vapor space in the tank be 93% air. This condition is for ignition whether you call it burning or explosion it's still the same. That's the minimum amount of air needed and that's a a lot of air.
The vapor space in a partially filled gasoline tank with a typical Reid Vapor Pressure of 9.5 PSI does not become flammable until the temperature has dropped to less than 10 deg F and does not become a serious hazard until it's between 0 deg F and -40 deg F.
