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I have mentioned this in other topics before, but I figured it deserves its own topic, to discuss possible implications. Petrol & diesel are perishable goods. It is difficult to say how long they last (If you know the answer please share it with us), but according to my research, depending on how you store it, somewhere between 3-6 months. There doesn't seem to be a major difference in the shelf life of petrol or diesel, it's more or less the same. If you store it in a fuel canister it will certanly outlast fuel stored in fuel tanks of cars. This is due to impurities and air in fuel tanks. Why should we care about perishable fuels? For one, the devs want to make a realistic game and it is a fact that Petrol & Diesel don't last forever. Two, it is a survial game and I love how food is perishable in game, it means you have to worry about constantly restocking your supply. I feel the same should apply to our fuel supply. It simply adds to the struggle of staying alive and thus adds to the fun factor this game creates so amazingly well. Implications once cars and fuel are added to the game: Similar to water and electricity, there will be a time where all the fuel found on the map has become obsolete. The question is, how long should fuel last? That will depend on where you get your fuel from: Siphoned from Cars: 6 months. Fuel Canister: 9 months. Gas Station: 9 months. You will notice I have extended the shelf life a bit and that is because during my research many people suggested that their petrol lasted beyond the specified 3-6 months period. Also in terms of gameplay, it would be handy to have the fuel left around the map last a little longer. What happens after 9 months have past? Obviously we will need access to a fuel source once all the exsisting fuels have gone bad. We only really have 2 options: (if you know of more options share them) Bio Diesel: It is relatively easy to produce bio diesel but the emphasis is on relatively. The process isn't to difficult to learn but you will need access to raw materials which aren't gonna be easy to come by in a post appocalyptic world. For one method you will require: Organic Oil, Methanol, Potassium or Sodium Hydroxide. There are many other methods which use other ingredients, so if you know of a simple one that would work in a post appocalyptic world please share it with us. Vegetable Oil: Diesel engines can also run on vegetable oil, which unlike bio diesel will be easier to produce. But it shares the same issue with bio diesel; you have to heat it up to ensure the fluidity is sufficiently high enough to be used in a diesel engine. Which can be an issue since most modified diesel powered cars use a 2 tank system (1 for diesel, 1 for bio diesel), that uses conventional diesel to heat up the bio diesel to operating temperature. Once again if you know of another method of using bio diesel without the help of conventional diesel, let us know. Also to make vegetable oil, we will need a suitable crop to grow and turn into oil. Rapeseed or Sunflower oil seem like a good choice, but if you have a better one share it with us. Choice of engine: Not sure how much thought the devs have put into this, but if fuel was made perishable, petrol engine cars will become useless after the petrol had gone bad. This means we will need to have both petrol and diesel powered cars in game. It would be nice to have a few modified diesel engine cars dotted around the map as a rare find. As far as I know, most if not all power generators are diesel powered, so that shouldn't be an issue once they are introduced. Summary: I have raised a few questions in this post, to which we will need to find answers: Do we want fuel to be perishable? if yes: How long should it last before going off? Do we want Bio Diesel in the game?, If yes what kind? Do we want Vegetable Oil as a fuel source?, If yes what plants do we need? What type of engined cars / generators do we want in the game? Do we need a new skill like mechanic to modify engines? Is this post a waste of time? Lastly, I am no expert on this subject, so feel free to point out any mistakes or things I have missed. Thank you for taking the time to read this post & I am looking forward to your comments.