I was excited when AAA changed its partnership to Shell and offered $.05 / gallon discount to members. Then, T-Mobile bought Sprint and gave me another weekly discount at Shell. Now, I also started using the Getupside app for another discount on fill ups, and you should, too.
While my Shell rewards doesn't allow me to fully stack the rewards, I do get "cash" back from Getupside that can be used for Amazon or Walmart gift cards. Instead of the normal $.12 per gallon, I get $.085 per gallon while saving $.05 at the pump, for a total of 13.5 pennies back per gallon. When gas is as low as $2.00 a gallon, that's a decent 6.75% off. I'm also not limited to Shell with Getupside, so I can just take the $.12 per gallon at a cheaper gas station that also offers my preference of top tier gasoline, though I have yet to research which local ones would be my best bet.