Pretty sure with petrol, they can't change the price while you are filling. Though according to most ICE drivers they only spend 11 seconds for the entire filling process, lol.Imagine if the price of anything changed between the time that you picked it up from the shelf to the time you got to the check out. Or Petrol. Does this happen? I’ve never noticed.
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I guess if they show the costs ahead of time, ie off-peak is x between these hours, and peak is y between these hours, then it'd be ok, but if they just varied pricing to whatever figure they want at any time, then no, I don't think that'd pass consumer protection laws.