Gas cashback apps like Upside pay a per-gallon amount at participating stations, while card-linked programs pay a percentage of your fuel purchase.

Upside requires claiming an offer before you pump, then paying with a linked card or uploading the receipt, with cashback posting within a few days.

Card-linked rewards are lower effort since they post automatically, but they often carry quarterly caps or rotating categories you must activate.

The two models stack: claim an Upside offer and pay with a gas-rewards card to earn both on the same fill-up.

Track your savings monthly, and remember that driving efficiently and avoiding out-of-the-way trips for small rewards saves more than any app.