Probably because no one is travelling and buying fuel. Forecourts still cost money to run so prices rise to ease their pain.
Suspect that there is suppliers controlling fuel production, after learning the mistakes from previous lock downs and having excess fuel and no where to store.
Or diesel fuel is used as heating fuel so cold snap taking up production?
@lynx started
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Probably because no one is travelling and buying fuel. Forecourts still cost money to run so prices rise to ease their pain.