Many preppers out there store some kind of extra fuel.It could be small cannisters of propane or a 25 or 50 pound tank. It might be plastic or metal jerry cans of gasoline treated with "Stabil". It might only be extra starter fluid for the barbeque pit. It matters not. The main thing is to practice safety in all your preppin' activities and to not break any local or state laws in this regards. Make sure to check your local and city ordinances to make sure that you are not breaking any laws. There may be limits on the number of propane cannisters you can have in your home. There may be and probably are limits on how much gasoline you are allowed to store in your garage or outdoor shed. We'd all like to have an underground storage tank full of gasoline but this is not always practical from a financial, as well as physical, standpoint. Check with your city's code compliance office, check with your local fire department, but by all means do not just ignore something that could have a devastating effect on you and your family and quite possibly someone else's. Chances are that if you're storing fuels in an improper manner someone is going to find out(and turn you in to the authorities) or "Murphy's Law" is going to get you.
Remember to practice safety in all things you do and to break no laws. This will only bring negative attention to your activities and danger to you or your family. Things like a 55 gallon drum of fuel stored improperly or illegally can make a very large hole in the ground in your neighborhood if something goes wrong.
So take the time to find out what's allowed and then prep within the allowed boundaries to meet your goals. If you only need 5 gallons of gas to get to your bugout location, then that should be your goal. Financially you won't be putting your money into an excess amount of something that you may not be able to use(if it gets confiscated because of a state or local law) and it makes little sense to have excess fuel storage if you have to leave it behind when you bugout. Have a specific reason for the amount and type of your fuel storage. Remember to also rotate your stock on a regular basis.
Store what you need and use what you store!
Stay above the water line!