 Call for your free info kit. 800-636-1881. 800-636-1881. 800-636-1881. 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. $5,000. That's crazy. If you drive, you have to download Upside, the free app that gives you cashback every time you get gas.