FuelRec

FuelRec is a fast fuel-economy tracker for up to five cars. It lets you quickly input mileage and travel distance using odometer or trip meters, edit and sort data, and add entries across days. It automatically calculates fuel economy at full-tank events when the distance isn't provided, and it supports both miles/km and gallons/liters. You can view fuel-economy trends in graphs and access statistics.

You can share the latest data via email or Twitter, import and export CSV files (UTF-8), assign an image to each car, and switch units as needed. The app includes Apple Watch quick-register widgets for mileage, with later fuel entry on iPhone, plus a built-in Twitter search for #FuelRec.