Buying while the price is lower and using it when the price is higher is always a good idea, with a few caveats:
I've seen it reported that traditional diesel can be stored for a year or more. But, after hydoscopic vegetable matter is added to create the now-common "B" type diesel fuel, the storage time is six months or less.
The use of additives such as Biobar-JF is often recommended when storing diesel in order to prevent microbes from gumming up the works, which will increase the cost slightly.
And storing the diesel in full tanks that have relatively small temperature-induced atmospheric moisture collection effects is also recommended.
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