 to get an extra 25 cents per gallon on your first tank. You can cash out anytime. Write to your bank, PayPal, or as a gift card for Amazon and other brands. Just download the free Upside app and use promo code 2024 for a 25 cents per gallon bonus on your first tank. That's code 2024 for a 25 cents per gallon bonus. That's code 2024.