There is a toggle in the settings that takes one to a launch screen and then give 3 fuel choices as options for 3 different prices.
I already paid for removal of ads in the app. I do not see any other paywalled features either. So, what are those payment options for? Are they there just to support the dev? Also, if one donates via there, would it then remove the option of launching, thus streamlining the interface to only the basics?
Yes, it’s just to support the dev.
Seems a bit excessive to want to remove that one option to streamline the UI. I could understand if there were dozens of root menu items, but it seems fairly unobtrusive to me.