We use Kroger fuel points. Every $100 you spend earns a 10-cent discount per gallon, up to 35 gallons. Oddly, we don't shop there much as we prefer the local neighborhood grocer. But here's the kicker at Kroger... they offer 2X fuel points on gift card purchases and 4X around the holiday season. Plus we have the AMEX Blue Cash card that gives 5% cashback on grocery purchases, including (you guessed it) gift card purchases at Kroger. The card also gives 5% on gas purchases at Kroger.
All my Amazon Christmas purchases are paid using gift cards from Kroger. Here's the math on a recent $400 purchase of Amazon gift cards:
$400 (Amazon gift cards purchased at Kroger; earned 4X or 1600 fuel points)
-$20 (5% cashback from AMEX for "grocery" purchase)
-$35 (used 1000 fuel points to purchase 35 gallons at $1.00/gal discount)
-$21 (used remaining 600 fuel points to purchase 35 gallons at $0.60/gal discount)
$324 (net cost of buying $400 of merchandise on Amazon... 19% discount)
Note I'm not including the additional 5% discount on the net gas purchases since I would have received that anyway, without the gift card purchases or fuel points. Most of the 19% discount comes from fuel points. It's still a good discount at 2X fuel points (12%), but really makes sense around the holidays when I tend to spend a lot on Amazon and Kroger boosts it to 4X. It also helps that we have a large SUV plus a 5-gal gas can that enables the full 35-gallon purchase. Otherwise you leave some money on the table. You also have to consume enough gas to utilize the fuel points before they expire at the end of the following month.
Anyway, there you have it. That's my Happy Holidays fuel point scam.