Comment by mdaniel

Reasonable people are going to differ about what "noticeable" means, and it will further differ based on the size of the tank in your vehicle, since a $0.04 difference times 8 gallons is not going to be the same as times 75 gallons

But, to answer your question, yes: I just checked and the spread seems to be $5.19 to $4.19 here. But to circle back to your original premise it's quite possible that even $15-ish is not worth the glucose/time spent interacting with this objectively terrible app and then driving to some likely inconvenient station