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Well I am currently self employed and do odd jobs. For a week in a month I go cutting grass with a 30cc two stroke weed cutter. Its been raining almost every other day so the grass grow faster and I am kept busy.
So the small amounts of fluctuations do matter. I prefer using a detergent softener bottle as the threads on the cap is longer. I think the longer thread gives better seal against water vapor ingress. As vapor pressure increase, it tends to tighten up the tolerance on the thread. I put a piece of folder paper to the cap to add to the protection.
I tend to think bigger containers are both more hazardous as the vapor builds up more. So I use lots of 5liter bottles. These are used softener/lube oil containers and it helps to recycle them plus I don't have to pay for anything. Currently gas pump prices are at its lowest this year so I am stocking up.
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