they could have already been reducing their gas expenses. Prime subscribers are able to save $0.10 per gallon at BP, ampm, and Amoco gas stations every day of the week. Amazon asserts that this can lead to savings of approximately $70 for the typical driver each year. With the annual cost of a Prime membership at $139, you can recover more than half of this amount solely through gas savings. This standard reduction is part of the $0.25 per gallon discount promoted by Amazon, indicating that the Fuel-up Fridays discount is actually $0.15. However, since you save more than twice as much on Fridays, it may be wise to plan your fill-ups around that day.