Purchase Visa Gift Cards issued by Metabank and earn 4x the gas rewards. Use a credit card that gives you cash or points back to earn even more (like 3% with Amex Blue Cash Everyday). Use the gift cards to pay for groceries (earning more gas points) or pay bills with sites like Evolve Money for free.
Here's how it works:
The cards say "Any Amount From $20-500". The best deal is to load $500 to the card because there is a flat fee of $5.95 per card. My store requires management approval for purchases over $500. The fee puts it over $500 so I load a little less to avoid the hassle.
To keep things simple lets say I earned points on $500 even. That's 2000 pts or $2 off per gallon. If you have a 25 gallon tank or a couple of gas cans that is worth $50 in free gas! Buy 2 cards and you've got a free fill-up!
I've also earned $15 from my credit card.
You can then use these cards to pay for your groceries and earn additional gas points or use them to pay bills or other expenses.