I downloaded the Mudflap app last week
https://www.mudflapinc.com/ and just had a chance to try it. The first time, retail price for diesel was $4.66, Mudflap price $4.46. The second time, retail price $5.25, Mudflap price $4.51. TSD also had a discount at the second station $4.67, so Mudflap was better in this case.
I plan to use both, depending on which one has a discount where I am stopping.
The second time I used Mudflap, the app would not give me a fuel code. It was almost midnight on Sat but customer assistance answered the phone! They gave me a fuel code and said, since I was new, my account had to be verified by management. I think that was taken care of today. In any case, their customer assistance seems to be great.
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Scott & Alta
2017 Montana 3160RL, Legacy, Onan 5.5Kw, Solar
2022 F-450 Lariat Ultimate