Startup Idea: Mileage and Vehicle Maintenance Tracker App

Startup idea to develop an app that tracks and calculates work miles driven, vehicle maintenance needs/costs, and hours driven. It should include a GPS log for route mapping and proof of mileage for expense reimbursements.

I need an app that will calculate my work miles driven, vehicle maintenance needs/costs, hours driven, that has a gps log that can be used as a map and proof of my mileage. My boss and I argue every 3 months when I submit my reimbursements and this would be a life saver.