8gb flash drives might be party favours, but as phones no longer let you stick a memory card in and the latest greatest handsets (eg: nexus 5x) are still shipping with 16 or 32gb of storage, the 50mb isn't insignificant.
Even if the OS uses 8GB of space you are talking about well under 1% of the leftover space. Sounds insignificant for something as important as transportation.
The latest version of the app supports Android 4.0.3 and up, as well as iOS 7 and up.
>with tons of space
The iOS app is 59MB. In 2015, you're claiming it's unreasonable to ask for a few megabytes? What? 8GB flash drives were party favors 5 years ago.