Shell's Nitrogen Gas any Chemistry Majors or Chemist?

You see Shell's commercial that their gas has Nitrogen in it to help rid and clean deposits on valves, etc. How can the fuel have nitrogen when Nitrogen's boiling point is -318.0 F Its not because the gas is pressurized.. So if Nitrogen IS in the gas, by the time that it gets to the consumer, whatever nitrogen that MIGHT have been placed is LONG gone by the time it reaches us. Ground tanks at fuel stations aren't pressurized.. and our fuel tanks on our cars do have some pressure but NOWHERE near the pressure needed to keep Nitrogen into a liquid form.. and the amount of pressure needed to keep nitrogen into a liquid form would blow the tanker trucks that transport to stations apart. LN2 (Nitrogen) will approach about 1600psig. Not many containers can withstand this pressure. So anyone have any comments or can explain how Shell can say that their gas contains nitrogen?? Something that's been bothering me since I saw the commercial. Im NOT a chemistry major, but I KNOW something doesn't sound right!!!