In the New York area, graphic designer Gordon Blau fills up his tank with leftover grease he gets for free from neighborhood Chinese restaurants.
"I take their oil and they say thank you," Blau said jokingly.
Blau's car runs on diesel. After mixing in the Chinese food grease, he only spends $20 every three weeks at the gas station.
The only downside: "It smells a bit like Chinese noodles," but it's a small price to pay when everyone else is paying nearly $4 per gallon.
"I would say I'm saving easily over $3,000 a year," Blau said.
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