Earn up to 50¢ per gallon cash back at 600+ gas stations in DC, MD, and VA - including all the big brands you know. With Upside, stations compete for your business with cash back offers. No gimmicks, no catch, just a free app to help you earn cash back. How it works: FIND offers near you, for up to 50¢ per gallon. PAY with any credit or debit card.