Fuel Up Fridays are back | Here's how Amazon Prime members can get 20 cents off per gallon of gas

The deal, which kicked off Friday, Oct. 2 and runs through Jan. 29, gives Prime members 20 cents off per gallon at bp, Amoco and participating ampm and Thorntons gas stations on Fridays. To qualify, Prime members must link their Amazon account to earnify, which is bp's fueling app.

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