Special offer! Join Upside and receive cash-back each time you fuel up. Use promo code 8WREX for an extra $5 back on your first fill-up. Scan the QR code with and get the easy to use app - which maps out the cheapest fuel in your area. (Upside is our go-to discount fuel app that has replaced GasBuddy when traveling. Works alongside most cash-back credit cards for extra savings per gallon! :-)