 Cashback is not available on gas in New Jersey and Wisconsin. $5,000. That's the average amount of money people in the U.S. are now spending on gas in a year. Five grand. That's crazy. If you drive, you have to download Upside, the free app that gives you cashback every time you get gas. That's right. You can earn real cashback with Upside just by buying the gas you're already buying. You can literally start earning cashback today. I use Upside every time I fill up, and I've already made around $200, $300.