How many potatoes and jerry cans needed in stranded deep?

I am about to complete stranded deep. But I want to know that how many potatoes and jerry can are required in total just for story mode. I just need fuel for aeroplane. Also I want to know if the crate glitch works in stranded deep. I read on reddit that if we drop crate, save game and then open it and if we dont like the items we can reload to the last checkpoint to open crate again for other random things. Does that work?

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