i think that because we are using 93 oct it's sitting in the gas station tanks longer no matter what since most cars don't need it. most people and their cars only need the lower oct so why waste the $$. maybe the people stopping at walmart/costcos go there for the cheap prices but get the high oct since it's also cheaper than most other places. hopefully because that's what i do, get the high 93 oct at the cheaper places.
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