I personally use WAZE as I use it for navigation too and it support real time petrol station planning inside of your current journey as the data is rely on user update data, remember to check and update the price if the price is not right ( same as petrolprices app) The Other thing good about waze is I show speed camera data Police location and break down location(by user report) And there is also a map at it if you need to correct information or as of admin to help correct the map