App Design for a petrol price app

This is what Savoya Consulting UG (haftungs was looking for in their app design

We want to build an app (android 1st, iOS 2nd), where the user can find the cheapest petrol station in his neighbourhood. The prices, geolocation of the gas station, etc. is provided by our webservice in JSON.

There are some sample apps:

https://play.google.com/store/apps/details?id=de.telekom.tanken
https://play.google.com/store/apps/details?id=de.msg
https://play.google.com/store/apps/details?id=de.mobilesoftwareag.clevertanken
https://play.google.com/store/apps/details?id=com.ptvag.android.adacgasprices
https://play.google.com/store/apps/details?id=com.tekaris.richtigtanken


The app should contain a DrawerNavigation, List of the cheapest gas stations, Markers of the gas station on google map,



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