Your not getting cash off the gift cards. Here is the basic math.
They offer .10 or .20 of a gallon of gas up to 30 gallons. for every $50 in gc you purchase. The .1-.20 off can be cumulative.
So If im planing I Disney trip I Normally buy like 4 - 5k in Disney gift cards
I wait most of the time for them to offer the .20 fuel perks reward.
$5,000 / $50 = 100 gift cards
100 gc x .20 discount = $20 off gas
$20 x 30 gallons = $600 in free gas.
Which is basically 12% off the price of Disney vacation.
No if you combine this with cash back credit card or Disney credit card. the savings can jump by 1-3% also, because the purchase of gift cards is basically in the class of buying groceries. So that's another $50-150 in real moneyish.