Put it in your vehicle's fuel tank each six to 9 months, and replace it with clean gasoline. 3. Do you retain at the very least 50 % a tank of fuel in your car or truck at all times? If not, be expecting to invest extended hrs queuing for fuel at gas stations in the hurry to fill up right before the storm hits - and you may well locate that your local gasoline station runs dry ahead of you can get to a pump.