Gas stations set the price you pay based on the wholesale price they paid per gallon + a markup so they can earn a small profit. The challenge is, the wholesale price that stations pay per gallon changes daily.
When the wholesale price goes up, gas stations either need to raise their sign prices (and potentially lose your business), or keep their sign prices low and lose profit. So, when wholesale gas prices are going up, gas stations are making less profit. And that means there’s less they can offer to you in the form of offers like the ones you see on Upside.
The good news is, you'll always pay less than the sign price with Upside. And even better, margins always rebound, and Upside offers will follow suit.