Fuel Economy Notebook

Simply enter the odometer reading, amount of fuel added, and amount paid when you fill up, and this retro-pop fuel economy notebook automatically calculates your fuel efficiency (km/L) using the full-tank method.

■ What You Can Do

・Calculate your fuel efficiency (km/L) from your last fill-up and your average fuel efficiency to date
・See your fuel price per liter (yen/L) and how much it costs to drive 1 km (yen/km)
・Visualize changes in fuel efficiency at a glance with a line graph
・Register multiple vehicles and switch between them instantly with tabs
・Distance traveled is automatically calculated from the difference between current and previous odometer readings. You won't get incorrect data even if you forget to reset your trip meter
・If you misenter an odometer reading, it will alert you on the spot saying "that's smaller than last time"
・You can edit any record anytime with a tap

■ Features

・No installation required. Just open it in your browser—works on smartphones and PCs alike
・No account registration needed, completely free
・All data stays on your device only. Nothing is sent to any server

■ Tips for Using

Record your data when you fill up to the top for accurate fuel efficiency (full-tank method). Your first record serves as the "baseline," so fuel efficiency calculations begin from your second fill-up.